You can use partial-products multiplication to

EM3SRB_G3_69A-69B.qxd
11/10/08
10:33 AM
Page 69
Operations and Computation
You can use partial-products multiplication to multiply
money amounts.
6 $4.25 ?
$
6 [$4.00s]
6 [$0.20s]
6 [$0.05s]
4 . 2 5
6
2 4 . 0 0
→
1 . 2 0
→
0 . 3 0
→ $ 2 5 . 5 0
6 $4.25 $25.50
Multiply.
1. 7 $6.43
2. $5.71 8
3. What is the cost of 3 DVDs at $9.95 each?
4. A pound of peaches costs $2.39. What is the cost
of 5 pounds of peaches?
Check your answers on page 343A.
69A
EM3SRB_G3_69A-69B.qxd
11/21/08
1:48 PM
Page 70
Operations and Computation
Partial-products multiplication works for larger money
amounts too.
3 $24.31 ?
$ 2 4 . 3 1
3 [$20.00s]
3 [$4.00s]
3 [$0.30s]
3 [$0.01s]
→
→
→
→ 6 0 .
1 2 .
0 .
0 .
$ 7 2 .
0
0
9
0
9
3
0
0
0
3
3
3 $24.31 $72.93
Multiply.
1. 2 $48.63
2. 8 $12.45
3. What is the cost of 6 pairs of pants at $18.99 per pair?
4. A popular hardcover book costs $26.35. What is the cost
of 6 books?
Check your answers on page 343A.
69B
EM3SRB_G3_74A-74J.qxd
11/21/08
1:50 PM
Page 115
Operations and Computation
You can also use U.S. traditional multiplication to multiply
money amounts.
7 $5.93 ?
2
Step 1: Start with the pennies.
7 3 pennies 21 pennies
21 pennies 2 dimes 1 penny
5 . 9 3
7
1
6
Step 2: Multiply the dimes.
7 9 dimes 63 dimes
Remember the 2 dimes from Step 1.
63 dimes 2 dimes 65 dimes in all
65 dimes $6 5 dimes
5 . 9 3
7
5 1
6
Step 3: Multiply the dollars.
Remember the $6 from Step 2.
7 $5 $35
$35 $6 $41 in all
Remember to include the decimal point
in the answer.
2
2
5 . 9 3
7
4 1 . 5 1
7 $5.93 $41.51
Multiply.
1. 6 445 ?
2. ? 3 $5.96
3.
5,692
4
Check your answers on page 343A.
74E
EM3SRB_G3_74A-74J.qxd
11/21/08
1:55 PM
Page 116
Operations and Computation
U.S. traditional multiplication works for larger money amounts too.
6 $42.39 ?
5
4 2 . 3
Step 1: Start with the pennies.
6 9 pennies 54 pennies
54 pennies 5 dimes 4 pennies
2
6 3 dimes 18 dimes
Remember the 5 dimes from Step 1.
18 dimes 5 dimes 23 dimes in all
23 dimes $2 3 dimes
3
1
6 $42.39 $254.34
74F
4
3
2
5
4 2 . 3
Step 4: Multiply the ten-dollar bills.
2 5
9
6
4
5
1
6 4 [$10]s 24 [$10]s
Remember the $10 bill from Step 3.
24 [$10]s 1 [$10] 25 [$10]s
25 [$10]s 2 [$100]s 5 [$10]s
Remember to include the decimal point
in the answer.
2
4 2 . 3
Step 3: Multiply the dollars.
6 $2 $12
Remember the $2 from Step 2.
$12 $2 $14 in all
$14 1 [$10] 4 [$1]s
5
4 2 . 3
Step 2: Multiply the dimes.
9
6
4
4 . 3
9
6
4
9
6
4

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