Homework 3-6
Name
Models for Subtracting
3-Digit Numbers
Another Look!
You can use place-value blocks
to model subtraction.
Find 234 - 192.
234
- 192
2
Step 1
Subtract the ones.
4 7 2. No regrouping
is needed.
4 ones 2 2 ones 5 2 ones
Step 2
1 13
234
- 192
42
Subtract the tens.
3 tens 6 9 tens, so
regroup 1 hundred
as 10 tens.
13 tens 2 9 tens 5 4 tens
Step 3
1 13
Subtract the
hundreds.
234
- 192
42
1 hundred 2 1 hundred 5 0 hundreds
Find the value of the remaining blocks: 4 tens + 2 ones = 40 + 2 = 42.
In 1 through 8, use place-value blocks or draw pictures to subtract.
1.
356
- 128
2.
261
- 122
3.
321
- 176
4.
446
- 257
5.
256
- 42
6.
374
- 188
7.
318
- 157
8.
431
- 279
Digital Resources at PearsonTexas.com
Topic 3 Lesson 3-6
173
9. You can compare the differences of
subtraction problems using the 7 or 6
symbols. Which of the following is NOT a
true comparison?
A
B
C
D
634 532 225 552 -
200 7
300 6
100 7
100 6
456 792 869 675 -
10. Explain Brady used place-value blocks to
model and find 364 - 247. Explain what
Brady should do next.
100
500
800
300
For 11 and 12, use the table at the right.
11. Mental Math Use mental math to find the total cost
of one tent and one sleeping bag. Explain how you
found the answer mentally.
Camping Equipment Sale
DATA
12. Extend Your Thinking A sleeping bag
usually costs $229. A tent usually costs
$265. How much could you save off the
regular price for each item? Which item
has a larger discount? Explain.
Sleeping bags
$195 each
Tents
$238 each
Water bottles (box of 12)
13. Tools Marcos measured the length of a crayon.
First, he used connecting cubes. Then, he used
paper clips. Did Marcos use more connecting
cubes or paper clips to measure the length? Explain.
174
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