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chapter1.4b
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àï1.4è Multiplying Whole Numbers.
äè Please Multiply the following Whole Numbers.
âSèMultiply
#êêêêêêÅ ì
êêë 7êêê2 8 4
#êêèx ╪╬êêè x ╪╪╪╪╪═
êêë42êêë1,4 2 0
éS To Multiply the Whole Number "5" times the Whole Number
"284", it is first necessary to multiply 5 times 4.ïThe answer, 20,
is recorded with the "0" in the ones place and the "2" carried to the
#tens place.êêêèì
êêêêë2 8 4
#êêêêïxï╪╪╪╪═
êêêêêï0
Next, the "5" is multiplied times "8" and the answer, 40 is added to the
"2" that was carried over.ïThis sum of 42 is recorded by writing the
"2" in the tens column and the "4" is carried to the hundreds column.
#êêêêëÅ ìêêêèÅ ì
êêêêë2 8 4êêê 2 8 4
#êêêêïxï╪╪╪╪═êêëx╪╪╪╪╪╪═
êêêêê2 0êêë 1,4 2 0
Finally, the "5" is multiplied times "2" and the answer, 10, is added to
the "4" that was carried over.ïThis sum of 14 is recorded with the
"4" in the hundreds column and the "1" in the thousands place.
Note that "0" times any number is always going to be "0", and that "1"
times any number does not change the number.ïAlso, multiplication can
be expressed as follows:è (5 ∙ 284è=è1,420).ïYou may prefer to
do your multiplication in a column as was done above.
è Remember if you have trouble recalling one of the multiplication
table facts, you can use your built in calculator to refresh your
memory.
1
êêë Multiplyêï5
#êêêêë xï╠
ëA)ï15êëB)ï20êëC)ï25êëD)ïå
ü
êêêêê 5
#êêêêëx ╪╠
êêêêê20
Ç B
2
êêè Multiplyêè 6
#êêêêë xï╬
ëA)ï36êëB)ï12êëC)ï24êëD)ïå
ü
êêêêê 6
#êêêêëx ╪╬
êêêêê36
Ç A
3
êêë Multiplyêï9
#êêêêë x ╪╚
ëA)ï18êëB)ï9êë C)ï0êë D)ïå
ü
êêêêê 9
#êêêêëx ╪╚
êêêêê 0
Ç C
4
êêè Multiplyêè 8
#êêêêë xï═
ëA)ï40êëB)ï42êëC)ï45êëD)ïå
ü
êêêêê 8
#êêêêëx ╪═
êêêêê40
Ç A
5
êêë Multiplyêï53
#êêêêë xï╪╠
ëA)ï196êè B)ï212êè C)ï206êè D)ïå
ü
#êêêêë î
êêêêë 53
#êêêêèx ╪╪╠
êêêêë212
Ç B
6
êêè Multiplyêè 86
#êêêêë xï╪═
ëA)ï380êè B)ï560êè C)ï430êè D)ïå
ü
#êêêêêÄ
êêêêê86
#êêêêè xï╪═
êêêêë 430
Ç C
7
êêë Multiplyêï88
#êêêêë xï╪╦
ëA)ï264êè B)ï380êè C)ï2,424êïD)ïå
ü
#êêêêêì
êêêêê88
#êêêêè x ╪╪╦
êêêêë 264
Ç A
8
êêè Multiplyêè 824
#êêêêë xï╪╪╠
ëA)ï4,183êïB)ï3,296êïC)ï2,984êïD)ïå
ü
#êêêêê î
êêêêê824
#êêêêè x╪╪╪╪╠
êêêêë3,296
Ç B
9
êêëMultiplyêï700
#êêêêëxï╪╪═
ëA)ï3,500êïB)ï42,500ê C)ï2,100êïD)ïå
ü
êêêêë 700
#êêêêèx ╪╪╪═
êêêêè 3,500
Ç A
10
êêèMultiplyêè 742
#êêêêëxï╪╪╦
ëA)ï4,226êïB)ï3,226êïC)ï2,226êïD)ïå
ü
#êêêêë î
êêêêë 742
#êêêêèx╪╪╪╪╦
êêêêè 2,226
Ç C
11
êêè Multiplyêï3407
#êêêêè xï╪╪╪═
ëA)ï17,035êïB)ï15,406ê C)ï19,035ê D)ïå
ü
#êêêêë ì Ä
êêêêë 3407
#êêêêèx ╪╪╪╪═
êêêêè 17,035
Ç A
12
êê Multiplyêè 69,856
#êêêêèxï╪╪╪╪╪╧
ëA)ï498,224êB)ï488,992êC)ï588,992êD)ïå
ü
#êêêêëæÉ ÄÅ
êêêêë69,856
#êêêêïx╪╪╪╪╪╪╪╧
êêêêè 488,992
Ç B
13
êê Multiplyêè 87,000
#êêêêèxï╪╪╪╪╪╠
ëA)ï368,000êB)ï358,000êC)ï348,000êD)ïå
ü
#êêêêëì
êêêêë87,000
#êêêêïx╪╪╪╪╪╪╪╠
êêêêè 348,000
Ç C
äïPlease Multiply the following two or three digit Whole
êêNumbers.
#âêêêë î
êêêêë 83
#êêêêë╪╩╠
êêêêë332
#êêêêè╪╔╬╬╪
êêêêè1,992
éSïTo Multiply the Whole Number"24" times the Whole Number
"83", it is first necessary to multiply the "4" times "83".
#êêêêë î
êêêêë 83
#êêêêèx ╪╩╠
êêêêë332
The answer, 332, is recorded just as was done in the previous problems.
Next, it is necessary to multiply the "2" times "83".ïThis product,
#166, is recorded as follows:ë î
êêêêë 83
#êêêêèx ╪╩╠êêê î
êêêêë332êêê 83
#êêêêè╪╔╬╬╪êêëx ╪╩╠
Finally, the "332" and "1660" are added together.ê 332
#êêêêêêêë ╪╔╬╬╪
êêêêêêêë 1,992
Thus, the product of 24 and 83 is 1,992.ïNote that the answer is the
same no matter which number is on top.
14
êêèMultiplyêè36
#êêêêëx ╩╠
ë A)ï864êè B)ï956êè C)ï728êè D)ïå
#üêêêê ì
êêêêê36
#êêêêè x ╪╩╠
êêêêë 144
#êêêêë╪╧╩╪
êêêêë 864
Ç A
15
êêèMultiplyêè30
#êêêêëx ╠╚
ë A)ï120êè B)ï1,200êïC)ï12êëD)ïå
ü
êêêêê30
#êêêêè x ╪╠╚
êêêêê00
#êêêêë╔╩╚╪
êêêêè 1,200
Ç B
16
êêèMultiplyêè83
#êêêêëx ╩╧
ë A)ï1,988êïB)ï2,241êïC)ï3,468êïD)ïå
#üêêêê ì
êêêêê83
#êêêêè x ╪╩╧
êêêêë 581
#êêêêë╔╬╬╪
êêêêè 2,241
Ç B
17
êêèMultiplyêè416
#êêêêëx ╪╩╚
ë A)ï83,220ê B)ï8,120êïC)ï8,320êïD)ïå
#üêêêêïî
êêêêê416
#êêêêè x ╪╪╩╚
êêêêë8,320
Ç C
18
êêèMultiplyêè677
#êêêêëx ╪╬═
ë A)ï44,005ê B)ï42,685ê C)ï46,465ê D)ïå
#üêêêê ÄÄ
êêêêê677
#êêêêè x ╪╪╬═
êêêêë 3385
#êêêêë╠╚╬╩╪
êêêêè 44,005
Ç A
19
êêèMultiplyêè605
#êêêêëx ╩╦╧
ë A)ï462,810êB)ï143,385êC)ï28,463ê D)ïå
#üêêêêïÄ
êêêêê605
#êêêêè x ╪╩╦╧
êêêêë 4235
êêêêë1815
#êêêêè ╔╩╔╚╪╪
êêêêè143,385
Ç B
20è If you earn $450 per week, find the total pay for 40
êêweeks of work.
ë A)ï$20,000êB)ï$15,000êC)ï$18,000êD)ïå
ü
#êêêêë ì
êêêêë 450
#êêêêè x ╪╠╚
êêêêï$18,000
Ç C
21èIf your car gets 42 miles per gallon and your tank holds
êë 16 gallons, how far can you drive on a tank of gas?
ë A)ï672 mi.êB)ï726 mi.êC)ï598 mi.êD)ïå
ü
êêêè 42 x 16è=è672 mi.
Ç A
22èIf you can work 27 problems in one hour, how many
êë problems can you work in 8 hours?
ë A)ï236êè B)ï216êè C)ï198êè D)ïå
ü
êêêè 27 x 8è=è216
Ç B
23èIf you receive a check of $265 per week, how much would
êë you receive in 52 weeks?
ë A)ï$12,680êB)ï$13,780êC)ï$14,280êD)ïå
ü
êêêï$265 x 52è=è$13,780
Ç B