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chapter3.4b
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à 3.4è Multiplying Decimal Numbers
äèPlease multiply the following Decimal Numbers.
âêê Multiplyë 32.5
êêêêêx .46
#êêêêê ────
êêêêê 1950
êêêêê1300
#êêêêë ──────
êêêêë 14.950
éS To multiply the Decimal Numbersï32.5 and .46, you should
first multiply them as though they are whole numbers.
êêêêë32.5
êêêêè x .46
#êêêêë────
êêêêë1950
êêêêè 1300
#êêêêè ─────
êêêêè 14950
To locate the decimal in the answer, you should count the total number
of decimal places in the two original numbers.
The original numbers, 32.5 and .46, have a total of three decimal places
counting the place for the "5" and the two places for the "4" and "6".
The decimal point in the answer should be located three places from the
right.
êêêêë32.5
êêêêè x .46
#êêêêë────
êêêêë1950
êêêêè 1300
#êêêêè──────
êêêêè14.950
To see why this works, change the decimal to fractions.
32.5 x .46ï=ï32 5/10 x 46/100ï=ï325/10 x 46/100ï=ï14950/1000
Dividing by "1000" moves the decimal three places to the left.ïThe
answer isï14.950.
1
êêêè Multiplyë7.5
êêêêê x 3.4
#êêêêêï────
ê A)ï25.5ê B)ï26.5ê C)ï24.5ê D)ïå
#üêêêë ì
êêêêë7.5
êêêêèx 3.4
#êêêêè ────
êêêêë300
êêêêè 225
#êêêêè─────
êêêêè25.50
Ç A
2
êêêè Multiplyë9.8
êêêêê x 5.7
#êêêêêï────
ê A)ï54.56êB)ï55.86êC)ï56.76êD)ïå
#üêêêë É
êêêêë9.8
êêêêèx 5.7
#êêêêè ────
êêêêë686
êêêêè 490
#êêêêè─────
êêêêè55.86
Ç B
3
êêêè Multiplyë58.7
êêêêêïxï25
#êêêêêï─────
ê A)ï1475.5ë B)ï1467.5ë C)ï146.75ë D)ïå
#üêêêë ÅÄ
êêêêë58.7
êêêêè xï25
#êêêêè ─────
êêêêë2935
êêêêè 1174
#êêêêè──────
êêêêè1467.5
Ç B
4
êêêëMultiplyë 9.5
êêêêêèx .46
#êêêêêè─────
ê A)ï53.7ê B)ï56.7ê C)ï4.37ê D)ïå
#üêêêêÄ
êêêêë 9.5
êêêêè x .46
#êêêêè ─────
êêêêë 570
êêêêë380
#êêêêè──────
êêêêè 4.370
Ç C
5
êêêèMultiplyë43.7
êêêêê x .96
#êêêêê ─────
ê A)ï41.952ë B)ï428.52ë C)ï42.852ë D)ïå
#üêêêë ìÅ
êêêêë43.7
êêêêè x .96
#êêêêè ─────
êêêêë2622
êêêêè 3933
#êêêêè──────
êêêêè41.952
Ç A
6
êêêè Multiplyë1.35
êêêêêïx .38
#êêêêêï─────
ê A)ï51.3ê B)ï5.23ê C)ï.5130êD)ïå
#üêêêë ì Å
êêêêë1.35
êêêêè x .38
#êêêêè ─────
êêêêë1080
êêêêë405
#êêêêè ─────
êêêêè .5130
Ç C
7
êêêè Multiplyë.693
êêêêêïx 7.3
#êêêêêï─────
ê A)ï50.859ë B)ï5.0589ë C)ï6.8589ë D)ïå
#üêêêêì
êêêêë.693
êêêêè x 7.3
#êêêêè ─────
êêêêë2079
êêêêè 4851
#êêêêè ─────
êêêêè5.0589
Ç B
# 8êêêêïÉì
êêêè Multiplyë.473
êêêêêïxï48
#êêêêêï─────
ê A)ï22.704ë B)ï21.834ë C)ï21.854ë D)ïå
#üêêêêÉì
êêêêë.473
êêêêè xï48
#êêêêè ─────
êêêêë3734
êêêêè 1892
#êêêêè ─────
êêêêè22.704
Ç A
9
êêêè Multiplyè 4.365
êêêêê xï.26
#êêêêê ──────
ê A)ï3.4789ë B)ï26.829ë C)ï1.1349ë D)ïå
#üêêêë ì ÄÄ
êêêêë4.365
êêêêè xï.26
#êêêêè ──────
êêêêë26190
êêêêë8730
#êêêêè ──────
êêêêè1.13490
Ç C
10
êêêè Multiplyè 1.009
êêêêê x .057
#êêêêê ──────
ê A)ï.57513ë B)ï.057513ëC)ï5.7513ë D)ïå
#üêêêêïæ
êêêêë1.009
êêêêè x .057
#êêêêè ──────
êêêêë 7063
êêêêë5045
#êêêêè ──────
êêêêè.057513
Ç B
11è Bill bought 5 shirts for $23.20 each.ïWhat was the total
êêcost of the shirts?
ê A)ï$116.00ëB)ï$96.00ë C)ï$86.00ë D)ïå
#üêêêë îî
êêêêè$ 23.20
êêêêïxë 5
#êêêêè───────
êêêêè$116.00
Ç A
12è If 1 gallon of water weighs 8.34 pounds, how much will
êê5 gallons weigh?
ëA)ï45.7 poundsè B)ï31.7 poundsè C)ï41.7 poundsè D)ïå
#üêêêêî ì
êêêêë 8.34
êêêêè xè 5
#êêêêè ──────
êêêêë41.70
Ç C
13è What is the cost of a 6.45 pound roast if the cost per
êêpound is $3.35?
êïA)ï$21.60ëB)ï$18.95ëC)ï$17.83ëD)ïå
#üêêêêì ì
êêêêë 6.45
êêêêè x 3.35
#êêêêè ──────
êêêêë 3225
êêêêë1935
êêêêè 1935
#êêêêè ──────
êêêêï$21.6075
Ç A
14è John earns $7.20 per hour.ïWhat is he paid if he works
êê48.5 hours?
êïA)ï$333.20è B)ï$349.20è C)ï$320.20è D)ïå
#üêêêêîî
êêêêë 48.5
êêêêè x 7.20
#êêêêè ──────
êêêêë 9700
êêêêè 3395
#êêêêï────────
êêêêï$349.200
Ç B