Reteaching
Name
5-3
Breaking Apart to Multiply
You can make multiplication easier by breaking larger numbers
apart by place value.
Find 3 × 35.
Break apart 35 into 30 + 5.
Multiply the tens.
3 × 30 = 90
Multiply the ones.
3 × 5 = 15
Add the partial products: 90 + 15 = 105
So, 3 × 35 = 105.
Complete.
1. 5 × 23
115
5 × 20 = 100
5 × 3 =
15
100 + 15 = 115
2. 4 × 246
984
4 × 200 =
800
4 × 40 = 160
4 × 6 =
24
800 + 160 + 24 = 984
Find each product. You may use place-value blocks or drawings to help.
126 5. 3 × 116 = 348 7. 3 × 352 =1,056
9. 4 × 34 = 136 3. 6 × 21 =
215 6. 5 × 22 = 110
8. 7 × 226 =1,582
10. 6 × 217 =1,302
4. 5 × 43 =
11. Number Sense Tim said, “To find 6 × 33, I can add 18 + 18.”
Do you agree with Tim? Why or why not?
No. Tim can add 18 tens or 6 3 30 5 180
and 18 ones or 6 3 3 to find the product.
R 5•3
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