Transcript 2 3 6 - Effingham County Schools

Subtraction
REGROUPING!!!
When you subtract you always begin with the ones place and
move left!
345
-231
114
Start here!
Step 1: Ask yourself “can I subtract
this?” if you can’t you need to regroup.
Step 2: Time to regroup! ALWAYS
take from your neighbor first!
Subtraction with regrouping
Take 1 and give 10!!!
We have to regroup when we cannot subtract the
numbers in a specific place (hint- if the top number is
SMALLER than the bottom you have to regroup).
343
-236
Sometimes you have to regroup more
than one time! Always follow these
steps when you regroup:
Yikes I can’t
subtract
that!
This means the neighbor goes down by
1 and you add a tens place to the
number that you can’t subtract.
Step 3: REPEAT!! Move to the next
place and do steps 1 and 2 over again!!
When you regroup you are taking 1 from the neighbor
and giving 10 to the place you cannot subtract.
Estimation and Subtraction
3 13
When do I estimate?
343
-2 3 6
Take 1 from
the tens place
and give 10 to
the ones place
Then you stop and subtract the ones place.
Now it is time to subtract the tens place- check it to
see if you can!!!!
3
13
343
-2 3 6
107
Can I subtract
the tens
place….YES!!
No regrouping
this time!
In subtraction word problems there is
a word that tells you when to estimate
(round). That word is ABOUT.
Estimating is suppose to make it faster
for you to solve the problem.
The first thing you have to do is round
both numbers to the largest place.
Then you subtract the two numbers
that you rounded.
EX.)
345 ---- 300
-123---- -100
200
Subtracting multi-digit numbers with and
without regrouping
Directions: Find the difference.
1.)
6,948
- 7,145
2.)
$5.75
- $2.24
3.)
7,714
- 3,226
4.)
4,526
- 2,313
5.)
3,328
- 1,265
6.)
$11.52
- $11.35
7.)
8,436
- 4,199
8.)
733
- 557
Directions: Write the correct answer.
9.) Jennie has 354 pencils. Miguel
has 189 pencils. How many more
pencils does Jennie have than
Miguel?
10.) Cindy earned $6.25 babysitting.
Marsha earned $4.76 washing
dishes. How much more money did
Cindy earn than Marsha?
11.) Ms. D’Angelo has 1,743 M&M’s.
She gave 269 to Mr. Aaron. How
many M&M’s does she have left?
12.) Mr. Phillips had 3,634
hamburgers. He gave 246
hamburgers to Mr. Aaron. How
many hamburgers does Mr. Phillips
have left?
Subtracting multi-digit numbers with and
without regrouping
Directions: Find the difference.
1.)
4,382
- 3,851
2.)
$50.23
- $17.72
3.)
6,512
- 2,345
4.)
7,180
- 5,965
5.)
$67.24
- $28.48
6.)
2,321
- 1,784
Directions: Write the correct answer.
7.) Khiry jumped 2,345 feet. Hunter
jumped 1,497 feet. How much
farther did Khiry jump than
Peter?
8.) Greg earned $38.67 on Monday.
He earned $22.98 on Friday. How
much more money did Greg earn
on Monday than on Friday?
19) Ms. D’Angelo has 4,836 tickets .
She gave 2,919 to her students.
How many tickets does she have
left?
10.) Bobby bought 3,145 tickets at the
fair. He gave 1,549 tickets to
Greg. How many tickets does
Bobby have left?
Subtracting multi-digit numbers with and
without regrouping
Directions: Find the difference.
1.)
306
- 158
2.)
$6.00
- $2.86
3.)
4.)
2,005
- 1,965
5.)
$80.00
- $54.97
6.)
-
7,050
2,345
8,000
- 1,562
Directions: Write the correct answer.
7.) Terrien jumped 700 inches.
Latoya jumped 387 inches. How
much longer did Terrien jump
than Latoya?
8.) Mr. Wayne had $40.00. He bought
two hamburgers and two fries for
$8.76. How much money does Mr.
Wayne have left to spend
tomorrow at McDonalds?
19) Mrs. Brantley had $4.03. She
bought a soda for $1.89. How
much change will Mrs. Brantley
get back?
10.) Logan has a sticker collection with
9,000 stickers. He gave 3,645
stickers to his brother Peter. How
many stickers does Logan have
left?
Subtracting multi-digit numbers with and
without regrouping
Directions: Estimate to find the difference.
1.)
727
- 154
2.)
$5.84
- $3.25
3.)
4.)
8,574
- 1,941
5.)
$28.33
- $14.67
6.)
6,467
- 3,378
9,213
- 1,924
Directions: Write the correct answer.
7.) Cindy ran 489 yards. Jan ran 167
yards. About how much farther
did Cindy run than Jan?
8.) Ben had $25.89. He bought a new
game for $22.99. About how much
money does Ben have left to
spend?
19) Ms. D’Angelo had $6.31. She
bought a dozen cookies for
$3.76. About how much change
will Ms. D’Angelo get back?
10.) Marsha has a stamp collection with
5,915 stamps. She sold 2,461
stamps to a friend. About how
many stamps does Marsha have
left?