Transcript 3rd_MA_NS_2.1_SUBTRACT_WHOLE_NUMBERS_DW

Learning Objective
Name________________________
Today, we will subtract numbers in the thousands.
CFU
What are we going to do today?
Activate (or provide) Prior Knowledge
In subtraction, regrouping is moving a group of numbers to the next lower place value.
• You have to regroup when the bottom digit1 in a column is greater than the top digit.
1
numbers zero to nine: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Subtract.
A.
41
526
-341
185
B.
51
638
-254
384
CFU
Teacher completes problem A; students complete problem B. Students, you already know how to regroup when subtracting numbers in
the hundreds. Today, we will subtract numbers in the thousands.
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3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Concept Development
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
• To set up subtraction, line up the numbers by place value, with the greater number on top.
Example: Mrs. Reyes’ class is collecting soda
cans. So far, the class has collected 1,638 cans.
Today, Mrs. Reyes sent 254 cans to the recycling
plant.
thousands
hundreds
tens
ones
Place Value
Chart
1
6
3
8
2
5
4
Th H T O
1

1
5
6 13 8
2 5 4
3 8 4
How many cans does the class have now?
When we subtract 254 from 1,638 the difference
is 1,384. The class now has 1,384 cans.
CFU
Read the following real-life subtraction problem:
Jill has 1,364 stamps. She sells 145 stamps. How many stamps does Jill have left?
On your whiteboards, write how many stamps Jill started with.
On your whiteboards, write how many stamps were taken away.
Which of the following shows the setup of the subtraction problem above? How do you know?
A
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1 4 5
1 3 6 4
B
1 3 6 4
1 4 5
3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Skill Development/Guided Practice
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
1. 1,643 – 438 =
2. 1,345 – 226 =
1,205
1,119
3
1, 6 4 13
4 3 8
1, 2 0 5
3. 2,736 – 1,528 =
3
1, 3 4 15
2 2 6
1, 1 1 9
4. 2,842 – 1,627 =
1,208
2
2, 7 3 16
1, 5 2 8
1, 2 0 8
1,215
3
2, 8 4 12
1, 6 2 7
1, 2 1 5
CFU
(#2) How did I/you line up the numbers?
(#3) How did I/you subtract each column?
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3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Skill Development/Guided Practice (continued)
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
5. The third grade class collected 4,583 cans of food for the animal
shelter. This week, the shelter used 3,724 cans. How many cans
of food does the shelter have left? The food shelter now has 859 cans.
3
4,15
3, 7
8
7
8 13
2 4
5 9
6. Texas Ted owns 5,346 acres3 of land. If he sells 4,529 acres of
land, how many acres will he have left?
4
5,13
4, 5
8
3
4 16
2 9
1 7
3unit
of land measure
Texas Ted has 817 acres left.
7. There are 8,280 feet of lumber at the lumber yard. The store sold 2,596
feet of lumber this past weekend. How many feet of lumber do they have
left?
They have 5,684 feet of lumber left.
7 11 17
8, 2 8 10
2, 5 9 6
5, 6 8 4
8. Last year, 9,531 people came to the town’s spring fair. This year, 5,678
fewer people came than the year before. How many people came this
year?
3,853 people came to the fair this year.
8 14 12
9, 5 3 11
5, 6 7 8
3, 8 5 3
CFU (#2) How did I/you line up the numbers?
(#3) How did I/you subtract each column?
(#4) How did I/you interpret the difference?
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3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Importance
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
1. Subtracting numbers in the thousands will help you work with larger numbers.
Fourth graders have a total of 92,373 stamps.
Third graders have 67,784 stamps. How many
more stamps do fourth graders have than
third graders?
8 11 12 16
9 2,3 713
- 6 7,7 8 4
2 4,5 8 9
2. Subtracting numbers will help you do well on tests.
CFU
Does anyone else have another reason why it is important to subtract numbers in the thousands? (pair-share) Why is it important to
subtract numbers in the thousands? You may give me one of my reasons or one of your own. Which reason is mostimportant to you?
Why?
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3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Concept Closure
A shows the incorrect way to set up the
subtraction problem 1,268 − 593.
B shows the correct way to set up the problem.
Explain why A is incorrect and B is correct.
A
5 9 3
1 2 6 8
B
1 2 6 8
5 9 3
___________________________________
___________________________________
Skill Closure
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
1. 1,456 - 238 = 1,218
4
1, 4 5 16
2 3 8
1, 2 1 8
2. There are 2,385 students in elementary school. In middle school, there
are 2,158 students. How many more students are there in elementary
school than in middle school?
7
2, 3 8 15
2, 1 5 8
2 2 7
There are 227 more
students in elementary
school than in middle
school.
Summary Closure
What did you learn today about subtracting numbers in the thousands? (pair-share)
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3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Name _________________________
Independent Practice
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
1. 1,637 - 118 =
1,519
2
1, 6 3 17
1 1 8
1, 5 1 9
2. 5,648 - 3,262 =
2,386
3. The college students found 3,634 species of dragonflies and 2,708 species of
praying mantises. How many more species of dragonflies are there than species
of praying mantises?
There are 926 more species of dragonflies than species of praying mantises.
4.There were 4,453 people at the fundraiser on Saturday, and 2,678 people came
to the fundraiser on Sunday. How many more people came to the fundraiser on
Saturday than on Sunday?
1,775 more people came to the fundraiser on Saturday than on Sunday.
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5
5, 6 14 8
3, 2 6 2
2, 3 8 6
2
3,16
2, 7
9
2
3 14
0 8
2 6
3 13 14
4, 4 5 13
2, 6 7 8
1, 7 7 5
3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Name _________________________
Periodic Review 1
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
1. 7,352 – 4,475 =
3.
2,877
6 12 14
7, 3 5 12
4, 4 7 5
2, 8 7 7
2. 9,846 - 4,851 =
4,995
A male hippopotamus weighs 3,874 kilograms. A female one weighs 2,567
kilograms. What is the difference of the weight of the two hippopotamuses?
The male hippopotamus weighs 1,307 kilograms more than the female one.
4. Maggie has 3,675 stamps in her collection. James has 2,746 stamps in his
collection. How many fewer stamps does James have than Maggie?
James has 929 fewer stamps than Maggie.
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8 17
9, 8 14 6
4, 8 5 1
4, 9 9 5
6
3, 8 7 14
2, 5 6 7
1, 3 0 7
2
3,16
2, 7
9
6
7 15
4 6
2 9
3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Name _________________________
Periodic Review 2
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
1. 3,563 – 2,473 =
3.
1,090
4
3, 5 16 3
2, 4 7 3
1, 0 9 0
2. 8,352 - 4,976 =
3,376
Margie and her friend Mari collect stickers as a hobby. Margie has collected
4,731 stickers, and Mari has collected 3,562 stickers. How many more stickers
has Margie collected than Mari?
Margie has collected 1,169 more stickers than Mari.
4.
Smith Elementary School served 1,853 lunches in March and 1,039 lunches in
April. How many fewer lunches did they serve in April than in March?
Smith Elementary School served 814 fewer lunches in April than in March.
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7 12 14
8, 3 5 12
4, 9 7 6
3, 3 7 6
6 12
4, 7 3 11
3, 5 6 2
1, 1 6 9
4
1, 8 5 13
1, 0 3 9
8 1 4
3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.
Name _________________________
Periodic Review 3
To subtract means to take away.
• The answer to a subtraction problem is called the difference.
Subtract numbers in the thousands.
Step #1: Read the subtraction problem carefully.
Step #2: Line up the numbers by their place value.
Step #3: Subtract each column starting from the right; regroup if needed.
Hint: You have to regroup when the bottom digit in a column is greater than the top digit.
Step #4: Interpret the difference. “The difference of _______ and _______ is _______.”
1. 8,776 – 7,768 =
3.
1,008
6
8, 7 7 16
7, 7 6 8
1, 0 0 8
2. 4,351 - 3,465 =
886
The Ramirez family traveled 3,452 miles during last summer’s vacation. If the
Johnson family traveled 2,472 miles during that time, how many fewer miles
did the Johnsons travel than the Ramirez family?
The Johnsons traveled
3 12 14
4, 3 5 11
3, 4 6 5
8 8 6
2 13
3, 4 15 2
2, 4 7 2
9 8 0
980 fewer miles than the Ramirez family during last summer’s vacation.
4.
John grew one pumpkin that weighed 5,773 ounces and another that weighed
3,439 ounces. How much less did the smaller pumpkin weigh?
The smaller pumpkin weighed 2,334 ounces less than the bigger pumpkin.
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6
5, 7 7 13
3, 4 3 9
2, 3 3 4
3rd Grade Number Sense 2.1 (4Q)
Find the sum or difference of two whole numbers between 0 and 10,000.
Lesson to be used by EDI-trained teachers only.