10 Digit Multiplication
40 X 20
1,200
7 x 43
301
How many partial products are in a 2 digit by 2 digit multiplication problem?
4
22 x 41
Use an area model
902
Alicia bought 47 packages of paper towels. There were 10 rolls in each package. How many rolls of paper towels did Alicia buy?
47 x 10 = 470 rolls of paper towels
60 X 70
4,200
7 x 76
532
What are the steps to solving a 2 digit by 2 digit multiplication problem with partial products?
1. Break up the factors into tens and ones.
2. Find 4 partial products.
3. Add the 4 partial products.
15 x 31
Use an area model
465
Mrs. McGuire wants to buy ornaments and trees for the school. Trees cost $12. Ornaments cost $5. If she buys 20 ornaments and 7 trees, how much does she spend?
(12 x 7) + (20 x 5) = $184
80 X 40
3,200
8 x 21
168
Which one of these is a partial product for 45 x 67?
a. 240
b. 2400
c. 24
b. 2400
24 x 56
Use partial products
1, 344
A cookie factory produced 42 packages of cookies. There were 6 cookies in each package. How many cookies did the factory produce in all?
42 x 6 = 252 cookies
90 X 70
6,300
9 x 65
315
What are the partial products for 87 x 56?
4000 (80 x 50)
480 (80 x 6)
350 (50 x 7)
42 (6 x 7)
40 x 42
Use partial products1,680
A hospital ordered 98 boxes of cotton swabs. There were 4 cotton swabs in each box. How many cotton swabs did the hospital order in all?
98 x 4 = 392 cotton swabs
30 x 40
1,200
4 x 32
128
What are the partial products of 23 x 15?
200 (20 x 10)
100 (20 x 5)
30 (10 x 3)
15 (3 x 5)
61 x 45
Any method
2, 745
Mrs. Hurley is selling cookies and brownies. Cookies are $3. Brownies are $4. If the class buys 32 cookies and 45 brownies. How much money did Mrs. Hurley get?
(32 x 3) + (45 x 4) = $276