Transcript 3 - My Teacher Pages

Chapter 3
Subtraction
Click the mouse or press the space bar to continue.
3
Subtraction
Lesson 3-1
Two-Digit Subtraction
Lesson 3-2
Estimate Differences
Lesson 3-3
Subtract Money
Lesson 3-4
Problem-Solving Skill: Reasonable
Answers
Lesson 3-5
Three-Digit Subtraction with Regrouping
Lesson 3-6
Problem-Solving Investigation: Choose
a Strategy
Lesson 3-7
Subtract Greater Numbers
Lesson 3-8
Subtract Across Zeros
Lesson 3-9
Algebra: Expressions and Number
Sentences
3-1
Two-Digit Subtraction
Five-Minute Check (over Chapter 2)
Main Idea
California Standards
Example 1
Example 2
3-1
Two-Digit Subtraction
• I will subtract two-digit and one-digit numbers.
3-1
Two-Digit Subtraction
Standard 3NS2.1 Find the sum or
difference of two whole numbers between
0 and 10,000.
3-1
Two-Digit Subtraction
A lion can run 50 miles per hour. A camel can run
20 miles per hour. How much faster can the lion
run?
You can use subtraction to solve the problem.
You need to find 50 – 20.
3-1
Two-Digit Subtraction
Step 1 Subtract ones.
50
– 20
0
0 ones – 0 ones = 0 ones
Step 2 Subtract tens.
50
– 20
5 tens – 2 tens = 3 tens
30
Answer: So, the lion can run 30 mph faster than
the camel.
3-1
Two-Digit Subtraction
Check
You can use addition to check your answer.
30 + 20 = 50
So the answer is correct.
3-1
Two-Digit Subtraction
A cheetah can run up to 70 miles per hour. A
rabbit can run up to 20 mph. How much faster
can a cheetah run?
A. 50 mph
B. 40 mph
C. 55 mph
D. 60 mph
3-1
Two-Digit Subtraction
A giraffe can run 32 miles per hour. An elephant
can run 25 miles per hour. How much faster can
the giraffe go?
You need to find 32 – 25.
Step 1 Subtract ones.
2 12
32
– 25
7
You cannot take 5 ones from 2 ones.
Regroup: 1 ten as 10 ones.
2 ones + ten ones = 12 ones
12 ones – 5 ones = 7 ones
3-1
Two-Digit Subtraction
Step 2 Subtract tens.
2 12
32
– 25
07
2 tens – 2 tens = 0 tens
Answer: So, the giraffe can run 7 mph faster than the
elephant.
3-1
Two-Digit Subtraction
Check
You can use addition to check your answer.
7 + 25 = 32
So the answer is correct.
3-1
Two-Digit Subtraction
A fox can run 42 miles per hour and a chicken can
run 9 miles per hour. How much faster is the fox?
A. 40 mph
B. 37 mph
C. 43 mph
D. 33 mph
3-2
Estimate Differences
Five-Minute Check (over Lesson 3-1)
Main Idea
California Standards
Example 1
Example 2
3-2
Estimate Differences
• I will estimate differences using rounding and
front-end estimation.
3-2
Estimate Differences
Standard 3NS1.4 Round off numbers to 10,000
to the nearest ten, hundred, and thousand.
Standard 3NS2.1 Find the sum or
difference of two whole numbers between
0 and 10,000.
3-2
Estimate Differences
Rosalinda bought a package of 62 carrots and
a bag of 18 potatoes. About how many more
carrots were there?
You need to estimate 62 – 18.
Step 1 Round each number to the nearest ten.
62
18
60
20
3-2
Estimate Differences
Step 2 Subtract.
60
– 20
40
Answer: So, there are about 40 more carrots.
3-2
Estimate Differences
Noah bought a bouquet of flowers with 19 roses
and 8 daisies. About how many more roses where
there?
A. 11
B. 10
C. 12
D. 8
3-2
Estimate Differences
It is 2,816 miles from Washington, D.C. to San
Francisco and 671 miles from Washington, D.C.
to Chicago. About how many miles further is it to
San Francisco? Round to the nearest hundred.
You need to estimate 2,816 – 671.
3-2
Estimate Differences
Step 1 Round each number to the nearest hundred.
2,816
671
2,800
700
3-2
Estimate Differences
Step 2 Subtract.
2,800
– 700
2,100
Answer: So, San Francisco is about 2,100 miles
further than Chicago.
3-2
Estimate Differences
It is 142 miles from Columbus, Ohio to Cleveland,
Ohio, and 106 miles from Columbus to Cincinnati,
Ohio. About how many miles further is it to
Cleveland? Round to the nearest ten.
A. 136 miles
B. 36 miles
C. 30 miles
D. 100 miles
3-3
Subtract Money
Five-Minute Check (over Lesson 3-2)
Main Idea
California Standards
Example 1
Example 2
3-3
Subtract Money
• I will subtract money.
3-3
Subtract Money
Standard 3NS2.1 Find the sum or
difference of two whole numbers between
0 and 10,000.
3-3
Subtract Money
Standard 3NS3.3 Solve problems involving
addition, subtraction, multiplication, and division of
money amounts in decimal notation and multiply
and divide money amounts in decimal notation by
using whole-number multipliers and divisors.
3-3
Subtract Money
Fina had 86 cents. She bought a bag of peanuts
for 73 cents. How much change did she receive?
You need to find the difference between 86¢ and 73¢.
3-3
Subtract Money
One Way: Subtract Cents
86¢
– 73¢
13 ¢
Subtract the ones.
Subtract the tens.
Place the cents sign after the difference.
3-3
Subtract Money
Another Way: Subtract Dollars
$0.86
– $0.73
$0.13
Answer: So, the difference is 13 cents.
3-3
Subtract Money
Check for Reasonableness
Since 13¢ is close to the estimate of 20¢, the
answer is reasonable.
Check Use addition.
So, the answer is correct.
3-3
Subtract Money
Marsalla had $0.49 and spent $0.28 on a pencil.
How much change did she receive?
A. 21¢
B. 20¢
C. 10¢
D. 22¢
3-3
Subtract Money
Marisa paid $34 for a pair of jeans. Dona paid $43.
How much more did Dona pay?
You need to find the difference between $34 and $43.
When you subtract money, you often need to regroup.
Estimate $43 – $34
$40 – $30 = $10
3-3
Subtract Money
3 13
$43
– $34
$ 9
Regroup 1 ten as 10 ones.
Subtract the ones.
Subtract the tens.
Place the dollar sign before the difference.
Answer: So, the difference is $9.
3-3
Subtract Money
Check for Reasonableness
Since $9 is close to the estimate of $10, the
answer is reasonable.
Check Use addition.
So, the answer is correct.
3-4
Problem-Solving Skill: Reasonable Answers
Five-Minute Check (over Lesson 3-3)
Main Idea
California Standards
Example 1: Problem-Solving Skill
3-4
Problem-Solving Skill: Reasonable Answers
• I will decide whether an answer is reasonable.
3-4
Problem-Solving Skill: Reasonable Answers
Standard 3MR3.1 Evaluate the reasonableness
of the solution in the context of the original
situation.
Standard 3NS2.1 Find the sum or difference of
two whole numbers between 0 and 10,000.
3-4
Problem-Solving Skill: Reasonable Answers
Kenji bought a box of 85 straws of 3 different
colors. He found that 53 straws were blue and
green. Kenji thinks that about 30 straws are
pink. Is this a reasonable answer?
3-4
Problem-Solving Skill: Reasonable Answers
Understand
What facts do you know?
• There are 85 straws.
• There are 3 colors of straws.
• There are 53 blue and green straws.
What do you need to find?
• Decide whether 30 is a reasonable amount of
pink straws.
3-4
Problem-Solving Skill: Reasonable Answers
Plan
Use subtraction to find the number of pink straws.
Then compare the answer to 30.
3-4
Problem-Solving Skill: Reasonable Answers
Solve
Subtract the number of blue and green straws
from the total number of straws.
85
– 53
32
Answer: Since 32 is close to 30, it is reasonable
to say that 30 of the straws are pink.
3-4
Problem-Solving Skill: Reasonable Answers
Check
Look back at the problem. Estimate by rounding.
85
– 53
90
– 50
40
So, the answer makes sense for the problem.
3-5
Three-Digit Subtraction with Regrouping
Five-Minute Check (over Lesson 3-4)
Main Idea
California Standards
Example 1
Example 2
Subtract Three-Digit Numbers with
Regrouping
3-5
Three-Digit Subtraction with Regrouping
• I will subtract three-digit numbers with regrouping.
3-5
Three-Digit Subtraction with Regrouping
Standard 3NS2.1 Find the sum or difference of
two whole numbers between 0 and 10,000.
Standard 3MR2.1 Use estimation to verify the
reasonableness of calculated results.
3-5
Three-Digit Subtraction with Regrouping
Binte has 215 baseball cards. Susana has 88. What
is the difference in the number of cards they have?
You need to find 215 – 88.
Step 1 Subtract ones.
0 15
215
– 88
7
You cannot take 8 ones from 5 ones.
Regroup 1 ten as 10 ones.
5 ones + 10 ones = 15 ones.
Subtract 15 ones – 8 ones = 7 ones.
3-5
Three-Digit Subtraction with Regrouping
Step 2 Subtract tens.
10
1 0 15
215
– 88
27
You cannot take 8 ones from 0 ones.
Regroup 1 hundred as 10 tens.
0 tens + 10 tens = 10 tens.
Subtract 10 tens – 8 tens = 2 tens.
3-5
Three-Digit Subtraction with Regrouping
Step 3 Subtract hundreds.
10
1 0 15
215
– 88
127
Subtract 1 hundred – 0 hundred = 1 hundred.
Answer: So, 215 – 88 = 127.
3-5
Three-Digit Subtraction with Regrouping
Samiya had $326 in her savings account. She spent
$99 on a new bike. How much is left in her savings
account?
A. $225
B. $227
C. $230
D. $227
3-5
Three-Digit Subtraction with Regrouping
Lauren bought a bracelet on sale for $7.59. How
much change did she receive from $7.75?
You need to find $7.75 – $7.59.
Step 1 Subtract cents.
6 15
$7.75
– $7.59
16
You cannot take 9 pennies from 5 pennies.
Regroup 1 dime as 10 pennies.
5 pennies + 10 pennies = 15 pennies.
Subtract 15 pennies – 9 pennies = 6 pennies.
Subtract 6 dimes – 5 dimes = 1 dime.
3-5
Three-Digit Subtraction with Regrouping
Step 2 Subtract dollars.
6 15
$7.75
– $7.59
$0.16
7 dollars – 7 dollars = 0 dollars.
Place the dollar sign before the difference.
Answer: So, Lauren received $0.16 in change.
3-5
Three-Digit Subtraction with Regrouping
Linda bought a purse for $9.77. How much change
did she receive from $10.00?
A.
$1.23
B.
$0.23
C.
$0.77
D.
$0.22
3-6
Problem-Solving Investigation: Choose a Strategy
Five-Minute Check (over Lesson 3-5)
Main Idea
California Standards
Example 1: Problem-Solving Investigation
3-6
Problem-Solving Investigation: Choose a Strategy
• I will choose the best strategy to solve a problem.
3-6
Problem-Solving Investigation: Choose a Strategy
Standard 3MR1.1 Analyze problems by
identifying relationships, distinguishing
relevant from irrelevant information,
sequencing and prioritizing information,
and observing patterns.
3-6
Problem-Solving Investigation: Choose a Strategy
Standard 3NS2.1 Find the sum or
difference of two whole numbers between
0 and 10,000.
3-6
Problem-Solving Investigation: Choose a Strategy
MIRANDA: For a class project, my
teacher needs 155 cardboard rolls
from paper towels. So far, Marissa
collected 24, Stan collected 32,
and I collected 18.
YOUR MISSION: Find out how many
more cardboard rolls are needed.
3-6
Problem-Solving Investigation: Choose a Strategy
Understand
What facts do you know?
• You know that 155 cardboard rolls are needed.
• Three students have already collected 24, 32,
and 18 cardboard rolls.
What do you need to find?
• Find how many more rolls are needed.
3-6
Problem-Solving Investigation: Choose a Strategy
Plan
First add to find the number of rolls collected.
Then, subtract to find the amount still needed.
3-6
Problem-Solving Investigation: Choose a Strategy
Solve
1
24
32
+ 18
74
So, 74 rolls have been collected.
3-6
Problem-Solving Investigation: Choose a Strategy
Solve
Subtract 74 from 155 to find out how many rolls
are still needed.
0 15
155
– 74
81
So, 81 cardboard rolls are needed.
3-6
Problem-Solving Investigation: Choose a Strategy
Check
Look back at the problem. You can check by
adding. Since 81 + 74 = 155, then answer is
correct.
3-7
Subtract Greater Numbers
Five-Minute Check (over Lesson 3-6)
Main Idea
California Standards
Example 1
Example 2
3-7
Subtract Greater Numbers
• I will learn to subtract three and four-digit
numbers.
3-7
Subtract Greater Numbers
Standard 3NS2.1 Find the sum or
difference of two whole numbers between
0 and 10,000.
3-7
Subtract Greater Numbers
What is the difference
between Angel Falls and
Yosemite Falls?
You need to find
3,212 – 2,425.
Step 1 Subtract ones.
0 12
3,212
– 2,425
7
You cannot take 5 ones from 2 ones.
Regroup 1 ten as 10 ones.
2 ones + 10 ones = 12 ones.
12 ones – 5 ones = 7 ones.
3-7
Subtract Greater Numbers
Step 2 Subtract tens.
10
1 0 12
3,212
– 2,425
87
You cannot take 2 tens from 0 tens.
Regroup 1 hundred as 10 tens.
0 tens + 10 tens = 10 tens.
10 tens – 2 tens = 8 tens.
3-7
Subtract Greater Numbers
Step 3 Subtract hundreds and thousands.
11 10
2 1 0 12
3,212
– 2,425
787
You cannot take 4 hundreds from 1 hundred.
Regroup 1 thousand as 10 hundreds.
1 hundred + 10 hundreds = 11 hundreds.
11 hundreds – 4 hundreds = 7 hundreds.
2 thousands – 2 thousands = 0 thousands.
Answer: So, 3,212 – 2,425 = 787.
3-7
Subtract Greater Numbers
4,321 people were at the baseball game on Friday.
2,667 people were there on Saturday. How many
more people came to the game on Friday?
A. 1,654
B. 1,774
C. 2,436
D. 2,654
3-7
Subtract Greater Numbers
The Nile River is 4,145 miles long. The Yangtze
River is 3,720 miles long. How much longer is the
Nile River than the Yangtze River?
Step 1 Subtract ones.
4,145
– 3,720
5
3-7
Subtract Greater Numbers
Step 2 Subtract tens.
4,145
– 3,720
25
Step 3 Subtract hundreds and thousands.
3 11
4,145
– 3,720
4 25
Answer: So, the Nile River is 425 miles longer.
3-7
Subtract Greater Numbers
The Sears Tower is 1,729 feet tall. The Empire
State Building is 1,472 feet tall. How much taller
is the Sears Tower?
A. 300 feet
B. 295 feet
C. 257 feet
D. 375 feet
3-8
Subtract Across Zeros
Five-Minute Check (over Lesson 3-7)
Main Idea
California Standards
Example 1
Example 2
3-8
Subtract Across Zeros
• I will learn how to subtract across zeros.
3-8
Subtract Across Zeros
Standard 3NS2.1 Find the sum or
difference of two whole numbers between
0 and 10,000.
3-8
Subtract Across Zeros
A large box of peppers weighs 200 pounds. A
small box of peppers weighs 145 pounds. What
is the difference in the weight of the two boxes?
You need to find 200 – 145.
3-8
Subtract Across Zeros
Step 1 Regroup.
1 10
200
– 145
You cannot take 5 ones from 0 ones.
Regroup.
There are no tens to regroup.
Regroup 2 hundreds as 1 hundred and 10 tens.
3-8
Subtract Across Zeros
Step 2 Regroup.
9
1 10 10
200
– 145
Regroup 10 tens as 9 tens and 10 ones.
3-8
Subtract Across Zeros
Step 3 Subtract.
9
1 10 10
Subtract the ones, tens, and hundreds.
200
– 145
55
Answer: So, 200 – 145 = 55.
3-8
Subtract Across Zeros
Anna’s bucket holds 800 ounces. Meena’s holds
655 ounces. How many more ounces does Anna’s
bucket hold?
A. 150 ounces
B. 140 ounces
C. 155 ounces
D. 145 ounces
3-8
Subtract Across Zeros
Gina and Bruce are playing a video game. Gina
scored 817 points for eliminating the red monster.
Bruce scored 3,000 points for eliminating the green
monster. How many more points did Bruce score?
You need to find 3,000 – 817.
3-8
Subtract Across Zeros
Step 1 Regroup.
2 10
3,000
– 817
You cannot take 7 ones from 0 ones.
There are no tens or hundreds.
Regroup 1 thousand as 10 hundreds.
3-8
Subtract Across Zeros
Step 2 Regroup.
9
2 10 10
3,000
– 817
Regroup again.
Regroup 1 hundred as 10 tens.
3-8
Subtract Across Zeros
Step 3 Regroup and subtract.
9 9
2 10 10 10
3,000
– 817
2,183
Regroup 1 ten as 10 ones.
Subtract.
10 ones – 7 ones = 3 ones
9 tens – 1 ten = 8 tens
9 hundreds – 8 hundreds = 1 hundred
2 thousands – 0 thousands = 2 thousands
Answer: So, Bruce scored 2,183 more points
than Gina.
3-8
Subtract Across Zeros
Check Add up to check.
So the answer is correct.
3-9
Algebra: Expressions and Number Sentences
Five-Minute Check (over Lesson 3-8)
Main Idea and Vocabulary
California Standards
Example 1
Example 2
Example 3
Example 4
3-9
Algebra: Expressions and Number Sentences
• I will learn to write and simplify expressions.
• expression
• number sentence
3-9
Algebra: Expressions and Number Sentences
Standard 3AF1.1 Represent relationships
of quantities in the form of mathematical
expressions, equations, and inequalities.
3-9
Algebra: Expressions and Number Sentences
Standard 3AF1.3 Select appropriate operational
and relational symbols to make an expression
true. (e.g., if 4 __ 3 = 12, what operational symbol
goes in the blank?).
3-9
Algebra: Expressions and Number Sentences
Write an expression for
the number of red apples
and yellow apples.
red apples
5
yellow apples
+
Answer: The expression is 5 + 3.
3
3-9
Algebra: Expressions and Number Sentences
Seth has 6 purple beads and Summer has 2 red
beads. Which expression shows how many beads
they have altogether?
A. 6 + 2
B. 6 – 2
C. 6 + 6
D. 2 + 2
3-9
Algebra: Expressions and Number Sentences
Write a number sentence
to show how many apples
are red and yellow.
red apples
5
yellow apples
+
3
=
Answer: The number sentence is 5 + 3 = 8.
8
3-9
Algebra: Expressions and Number Sentences
Gwen has 4 cookies and Marissa has 5 cupcakes.
Which number sentence shows how many treats
they have altogether?
A. 5 – 4
B. 4 + 5
C. 4 + 5 = 9
D. 5 – 4 = 1
3-9
Algebra: Expressions and Number Sentences
Use + or – to make the number sentence true.
Try +.
17 8 = 9
17 + 8 = 9
25
=9
Answer: false: 25 does not equal 9
3-9
Algebra: Expressions and Number Sentences
Try –.
17 8 = 9
17 – 8 = 9
9
Answer: true
=9
3-9
Algebra: Expressions and Number Sentences
Which number sentence is true?
A.
5+3=2
B.
5+3=8
C.
5–3=8
D.
5+8=2
3-9
Algebra: Expressions and Number Sentences
Compare 6 + 9
6+9
15
15
8 + 6 + 2.
16
< 16
8 + 6 + 2. Use <, >, or =.
Write the expressions. Add 6 + 9.
Add 8 + 6 + 2.
Compare.
Answer: So, 6 + 9 < 8 + 6 + 2.
3-9
Algebra: Expressions and Number Sentences
Complete the number sentence.
3+4+2
2+5+2
A. <
B. >
C. =
D. +
3
Subtraction
Five-Minute Checks
Subtract Three-Digit Numbers with
Regrouping
3
Subtraction
Lesson 3-1
(over Chapter 2)
Lesson 3-2
(over Lesson 3-1)
Lesson 3-3
(over Lesson 3-2)
Lesson 3-4
(over Lesson 3-3)
Lesson 3-5
(over Lesson 3-4)
Lesson 3-6
(over Lesson 3-5)
Lesson 3-7
(over Lesson 3-6)
Lesson 3-8
(over Lesson 3-7)
Lesson 3-9
(over Lesson 3-8)
3
Subtraction
(over Chapter 2)
Find the difference of 200 – 189.
A. 9
B. 21
C. 1
D. 11
3
Subtraction
(over Chapter 2)
Find the difference of $3.00 – $1.67.
A. $1.33
B. $1.13
C. $0.13
D. $1.43
3
Subtraction
(over Chapter 2)
Find the difference of 5,500 – 1,254.
A. 3,246
B. 4,246
C. 4,446
D. 3,200
3
Subtraction
(over Chapter 2)
Find the difference of 6,000 – 5,454.
A. 645
B. 446
C. 556
D. 546
3
Subtraction
(over Chapter 2)
Find the difference of $70.00 – $22.17.
A. $47.81
B. $34.83
C. $24.38
D. $47.83
3
Subtraction
(over Lesson 3-1)
Find the value of (9 – a) + 7 if a = 4.
A. 12
B. 13
C. 10
D. 22
3
Subtraction
(over Lesson 3-1)
Find the value of x + (3 – 2) if x = 3.
A. 2
B. 4
C. 3
D. 1
3
Subtraction
(over Lesson 3-1)
Find the value of 8 + (15 – x) if x = 3.
A. 15
B. 10
C. 5
D. 20
3
Subtraction
(over Lesson 3-1)
Find the value of 4 + (a + 5) if a = 4.
A. 13
B. 12
C. 11
D. 10
3
Subtraction
(over Lesson 3-1)
Find the value of (a + 4) – 3 if a = 4.
A. 3
B. 5
C. 11
D. 6
3
Subtraction
(over Lesson 3-2)
Solve 6 + n = 13 mentally.
A. n = 8
B. n = 9
C. n = 7
D. n = 2
3
Subtraction
(over Lesson 3-2)
Solve k – 2 = 7 mentally.
A. k = 9
B. k = 8
C. k = 4
D. k = 3
3
Subtraction
(over Lesson 3-2)
Solve 8 – g = 3 mentally.
A. g = 5
B. g = 6
C. g = 1
D. g = 4
3
Subtraction
(over Lesson 3-2)
Solve x + 4 = 15 mentally.
A. x = 10
B. x = 11
C. x = 1
D. x = 13
3
Subtraction
(over Lesson 3-3)
Identify any missing information. Then solve if
possible. An express train leaves Grand Terminal at
5:05 P.M. The train arrives at the first stop at 5:21
P.M., the second stop at 5:46 P.M., and the last stop
at 6:04 P.M. How long is the train ride?
A. 56 minutes
B. 39 minutes
C. 58 minutes
D. 59 minutes
3
Subtraction
(over Lesson 3-4)
Use a rule to write an equation to describe the
pattern. Then use the equation to find the next
three numbers in the pattern.
A. x + 5 = y; 13, 15, 18
B. y + 4 = y; 11, 15, 17
C. x + 11 = y; 12, 15, 19
D. x + 4 = y; 12, 15, 18
3
Subtraction
(over Lesson 3-5)
Use the Four-Step Plan in this problem; solve if
possible. Viviana is taking a late train from home
to visit her cousins. The train leaves Savannah at
11 A.M. and arrives in Charleston at 1:30 P.M. on
July 13. How long is Viviana’s trip?
A. 3 hours and 15 minutes
B. 2 hours
C. 3 hours
D. 2 hours and 30 minutes
3
Subtraction
(over Lesson 3-6)
Solve. Tell what strategy you used. Chris bought
tomatoes for $2.58 and lettuce for $1.99. About how
much change did he receive for $10.00?
A. $5.00
B. $4.00
C. $2.50
D. $9.00
3
Subtraction
(over Lesson 3-7)
Subtract. Check for reasonableness.
1,621 – 349
A. 1,908
B. 802
C. 902
D. 1,272
3
Subtraction
(over Lesson 3-7)
Subtract. Check for reasonableness.
2,837 – 495
A. 2,342
B. 2,242
C. 2,102
D. 900
3
Subtraction
(over Lesson 3-7)
Subtract. Check for reasonableness.
6,255 – 3,187
A. 3,222
B. 3,068
C. 2,988
D. 1,555
3
Subtraction
(over Lesson 3-7)
Subtract. Check for reasonableness.
7,243 – 5,491
A. 1,752
B. 1,522
C. 1,255
D. 900
3
Subtraction
(over Lesson 3-8)
Subtract. Check for reasonableness.
503 – 28
A. 475
B. 252
C. 105
D. 400
3
Subtraction
(over Lesson 3-8)
Subtract. Check for reasonableness.
800 – 136
A. 466
B. 545
C. 538
D. 664
3
Subtraction
(over Lesson 3-8)
Subtract. Check for reasonableness.
$17.00 – $1.49
A. $15.15
B. $13.55
C. $15.51
D. $9.55
3
Subtraction
(over Lesson 3-8)
Subtract. Check for reasonableness.
$3,500 – $1,875
A. $1,625
B. $1,555
C. $925
D. $1,375
This slide is intentionally blank.