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chapter1.5b
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àï1.5ëDividing Whole Numbers.
äè Please divide the following Whole Numbers.
â
êê 8êêè72êêè75
#êë ┌──êê┌────êê┌────
#êè 9 │72êë4 │ 288êë3 │ 225
#êê╧╩êêï╩╨╪êêï╩╔╪
êêêêë 8êêè15
#êêêêë╪╨êêè╔═
éS To divide the Whole Number "225" by the Whole Number "3", it
is first necessary to divide 3 into 22.ïThe answer, 7, is recorded as
shown below.êêêï7
#êêêêè ┌────
#êêêêï3 │ 225
The number "7" is multiplied times "3" to get 21.ïThis number is
recorded under the "22".êè 7
#êêêêè ┌────
#êêêêï3 │ 225
#êêêêë ╩╔╪
Twenty-one is subtracted from 22 and the five is brought down.
êêêêê7
#êêêêè ┌────
#êêêêï3 │ 225
#êêêêë ╩╔╪
êêêêê15
Next, the "3' must be divided into "15".ïThe answer, 5, is recorded
next to the 7 in the ones place.ïThis "5" is multiplied times the
"3" and the answer, 15, is recorded as shown.
êêêêê75
#êêêêè ┌────
#êêêêï3 │ 225
#êêêêë ╩╔╪
êêêêê15
#êêêêê╔═
Thus, 225 divided by 3 is 75.ïNote that any non-zero number divided
into itself is 1.ïAlso , any number divided by one is unchanged.
Finally, division by zero is not allowed, because that would be infinity
and infinity is not a real number.ïDon't forget to use your built in
calculator if you need it.
1
#êêëDivideêï┌────
#êêêêè 4 │ 28
ëA)ï7êëB)ï6êë C)ï8êë D)ïå
ü
êêêêê7
#êêêêè ┌───
#êêêêï4 │ 28
#êêêêë ╩╨
Ç A
2
#êêë Divideêï┌────
#êêêêë7 │ 49
ëA)ï9êëB)ï8êë C)ï7êë D)ïå
ü
êêêêê7
#êêêêè ┌───
#êêêêï7 │ 49
#êêêêë ╠╤
Ç C
3
#êêë Divideêï┌────
#êêêêë5 │ 75
ëA)ï20êè B)ï15êëC)ï25êëD)ïå
ü
êêêêë 15
#êêêêè ┌───
#êêêêï5 │ 75
#êêêêë ═╪
êêêêë 25
#êêêêë ╩═
Ç B
4
#êêë Divideêï┌────
#êêêêë3 │ 690
ëA)ï203êèB)ï230êè C)ï23êëD)ïå
ü
êêêêë 230
#êêêêè ┌────
#êêêêï3 │ 690
#êêêêë ╬╪╪
êêêêê9
#êêêêê╤╪
êêêêê 0
#êêêêê ╚
Ç B
5
#êêë Divideêï┌─────
#êêêêë6 │ 1824
ëA)ï340êèB)ï34êëC)ï304êè D)ïå
ü
êêêêê304
#êêêêè ┌─────
#êêêêï6 │ 1824
#êêêêë ╔╨╪╪
êêêêê 24
#êêêêê ╩╠
Ç C
6
#êêë Divideêï┌─────
#êêêêë8 │ 6432
ëA)ï804êèB)ï84êëC)ï840êè D)ïå
ü
êêêêê804
#êêêêè ┌─────
#êêêêï8 │ 6432
#êêêêë ╬╠╪╪
êêêêê 32
#êêêêê ╦╩
Ç A
7
#êêë Divideêï┌─────
#êêêêë6 │ 6324
ëA)ï1,054ê B)ï154êè C)ï1,540êïD)ïå
üêêêê1054
#êêêêè ┌─────
#êêêêï6 │ 6324
#êêêêë ╬╪╪╪
êêêêê32
#êêêêê╦╚╪
êêêêê 24
#êêêêê ╩╠
Ç A
8
#êêë Divideêï┌─────
#êêêêë7 │ 3920
ëA)ï560êèB)ï5,600êïC)ï56êëD)ïå
üêêêê 560
#êêêêè ┌─────
#êêêêï7 │ 3920
#êêêêë ╦═╪╪
êêêêê42
#êêêêê╠╩╪
êêêêêï0
#êêêêêï╚
Ç A
9
#êêë Divideêï┌──────
#êêêêë5 │ 17350
ëA)ï347êèB)ï3,047êïC)ï3,470êïD)ïå
üêêêê 3470
#êêêêè ┌──────
#êêêêï5 │ 17350
#êêêêë ╔═╪╪╪
êêêêê23
#êêêêê╩╚╪╪
êêêêê 35
#êêêêê ╦═╪
êêêêêè0
#êêêêêè╚
Ç C
äïPlease divide the following Whole Numbers and record the
êêremainder with the answer.
âêêêêêè 69r1
#êêê 5r2êêè ┌──────
#êêë┌─────êêï6 │ 415
#êêè5 │ 27êêê ╦╬╪
#êêê╩═êêêï55
#êêê 2êêêï═╠
êêêêêêë1
éS To divide the Whole Number "415" by "6", you should proceed as
in the previous problems until you get to the "ones" place.
êêêêê69
#êêêêè ┌──────
#êêêêï6 │ 415
#êêêêë ╦╬╪
êêêêê55
#êêêêê═╠
êêêêê 1
At this point you realize that "6" does not divide evenly into "415".
The extra "1" is the remainder and is recorded as "r1" next to the
"69". Thus the answer is 69r1.ïYou could say that 6 divides into
415 sixty-nine times with one left over.
10
#êêèDivideêë ┌────
#êêêêë 4 │ 26
ë A)ï5r4êè B)ï6r2êè C)ï7r1êè D)ïå
ü
êêêêê 6r2
#êêêêë┌─────
#êêêêè4 │ 26
#êêêêê╩╠
êêêêê 2
Ç B
11
#êêèDivideêë ┌────
#êêêêë 7 │ 73
ë A)ï10r3êèB)ï9r6êè C)ï11r1êèD)ïå
ü
êêêêê10r3
#êêêêë┌─────
#êêêêè7 │ 73
#êêêêê╧╪
êêêêê 3
#êêêêê ╚
êêêêê 3
Ç A
12
#êêèDivideêë ┌────
#êêêêë 5 │ 842
ë A)ï158r2êïB)ï181r4êïC)ï168r2êïD)ïå
üêêêê 168r2
#êêêêë┌──────
#êêêêè5 │ 842
#êêêêê═╪╪
êêêêê34
#êêêêê╦╚╪
êêêêê 42
#êêêêê ╠╚
êêêêêï2
Ç C
13
#êêèDivideêë ┌────
#êêêêë 7 │ 814
ë A)ï114r2êïB)ï116r2êïC)ï112r2êïD)ïå
üêêêê 116r2
#êêêêë┌──────
#êêêêè7 │ 814
#êêêêê╧╪╪
êêêêê11
#êêêêê╪╧╪
êêêêê 44
#êêêêê ╠╩
êêêêêï2
Ç B
äïPlease divide the following Whole Numbers.
âêêêê21r6
#êêêêè ┌──────
#êêêê 23 │ 489
#êêêêë ╠╬╪
êêêêê29
#êêêêê╩╦
êêêêê 6
éS To divide 489 by 23, estimate how many times 23 will go
into 48.ïYou can find a first guess by dividing 2 into 4.ïIf that
guess does not work, lower the guess by one.ïSince 2 goes into 4 twice,
record this estimate above the 8.
êêêêê 2
#êêêêë┌─────
#êêêêï23 │ 489
Multiply 2 times 23 and record the answer under the 48.
êêêêê 2
#êêêêë┌─────
#êêêêï23 │ 489
#êêêêê╠╬╪
êêêêê 29
Six is subtracted from 8 and the 9 is brought down.ïNext, divide 23
into 29.êêêê21
#êêêêë┌─────
#êêêêï23 │ 489
#êêêêê╠╬╪
êêêêê 29
#êêêêê ╩╦è Thus, the answer is 21r6.
êêêêêï6
14
#êêê Divideê┌───
#êêêêè 41 │ 85
ë A)ï42r1êèB)ï2r3êè C)ï28r2êèD)ïå
ü
êêêêê2r3
#êêêêè ┌─────
#êêêê 41 │ 85
#êêêêë ╨╩╪
êêêêê3
Ç B
15
#êêê Divideê┌────
#êêêêè 24 │ 647
ë A)ï26r23êïB)ï28r2êèC)ï25r3êèD)ïå
üêêêê 26r23
#êêêêè ┌───────
#êêêê 24 │ 647
#êêêêë ╠╨╪
êêêêë 167
#êêêêë ╔╠╠
êêêêê23
Ç A
16
#êêê Divideê┌────
#êêêêè 31 │ 856
ë A)ï42r4êèB)ï26r3êèC)ï27r19êïD)ïå
üêêêê 27r19
#êêêêè ┌───────
#êêêê 31 │ 856
#êêêêë ╬╩╪
êêêêë 236
#êêêêë ╩╔╧
êêêêê19
Ç C
17
#êêê Divideê┌────
#êêêêè 22 │ 861
ë A)ï28r19êïB)ï39r3êèC)ï41r3êèD)ïå
üêêêê 39r3
#êêêêè ┌───────
#êêêê 22 │ 861
#êêêêë ╬╬╪
êêêêë 201
#êêêêë ╔╤╨
êêêêê 3
Ç B
18
#êêê Divideê┌──────
#êêêêè 91 │ 6845
ë A)ï70r25êïB)ï75r20êïC)ï65r30êïD)ïå
üêêêêï75r20
#êêêêè ┌────────
#êêêê 91 │ 6845
#êêêêë ╬╦╧╪
êêêêê475
#êêêêê╠══
êêêêê 20
Ç B
19
#êêê Divideê┌──────
#êêêêè 68 │ 8569
ë A)ï126r1êïB)ï226r25ê C)ï386r52ê D)ïå
üêêêê 126r1
#êêêêè ┌────────
#êêêê 68 │ 8569
#êêêêë ╬╨╪╪
êêêêë 176
#êêêêë ╔╦╬╪
êêêêê409
#êêêêê╠╚╨
êêêêêï1
Ç A