Reteaching
Name
3-4
Multiplying 2-Digit by
2-Digit Numbers
Find 43 3 26.
Step 1: Multiply by the ones.
Regroup if necessary.
What You Think
6 3 3 ones 5 18 ones
Regroup 18 ones as 1 ten
and 8 ones.
What You Write
6 3 4 tens 5 24 tens
24 tens 1 1 ten 5 25 tens
Regroup 25 tens as 2 hundreds
and 5 tens.
Step 2: Multiply by the tens.
Regroup if necessary.
What You Think
20 3 3 ones 5 60 ones
Regroup 60 ones as 6 tens.
1
43
3 26
258
1
43
3 26
258
860
20 3 4 tens 5 80 tens
Regroup 80 tens as 8 hundreds.
Step 3: Add the partial products.
What You Think
6 3 43 5 258
20 3 43 5 860
1
43
3 26
258
1 860
1,118
partial
products
Find the product.
1.
38
3 12
2.
64
3 33
3.
49
3 27
4.
85
3 15
5.
26
3 21
6.
73
3 19
7.
57
3 28
8.
91
3 86
9. In the problem 62 3 45, what are the partial products?
R 3•4
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Practice
Name
3-4
Multiplying 2-Digit by
2-Digit Numbers
Find each product. Estimate to check that your answer is
reasonable.
1.
56
3 34
2.
45
3 76
3.
35
3 15
4.
47
3 94
5.
64
3 51
6.
47
3 30
7.
56
3 19
8.
92
3 49
9. To pay for a sofa, Maddie made a payment
of 64 dollars each month for one year. How
much did the sofa cost ?
10. Katie is in charge of buying juice for the teachers’ breakfast party. If
one teacher will drink between 18 and 22 ounces of juice, and there are
32 teachers, which is the best estimate for the amount of juice Katie should buy?
A
B
C
D
about 200 ounces
about 400 ounces
about 600 ounces
about 800 ounces
11. Is 7,849 a reasonable answer for 49 3 49? Why or why not?
P 3•4
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