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\,Vritea multiplicationsentencethat correspondsto eachsituation.
H
l. The LosAngelesSunday ?iruescrossword puzzle is
arrangedrectangularlywith squaresin 21 rows and
21 columns. How many squaresdoes the puzzle
have altogether? 21 . 21 : 441
2. Pixels. A digital phototgraph is storedusing small
rectangular dots called pixels. How many pixels are
there in a digital photo that has 600 rows with 400 pixels
in each row? 600 . 400 : 240,000
3. A new soft drink beveragecarton contains B cans,each
of which holds 12 oz. How many ouncesare there in
the carton? B . 72 or, : 96 oz
4. There are 7 days in a week. How many days are there in
l 8 w e e k s ?t 8 ' 7 : 1 2 6
5. (bnt.puterPrinters. The HP Photosmart8250can print
4800 x 1200dots per squareinch (dpi), optimized. How
many dots can it print in one squareinch?
6. Corrtlttrtet'
Pritrt.ers. The Epson StylusPhoto Rl800 can
print 5760 x 1440dots per squareinch (dpi), optimized.
How many dots can it print in one squareinch?
Source:
www.hp.com
Source:
www.epson.com
4i]00.1200-5.760.000
5 7 6 0 1 4 4 0: 8 , 2 9 4 , 4 0 0
Multiply.
7.
B7
xl0
B.
x
870
11.
6 5
XB
520
100
96
9.
B7
X4
34u
r0.
x
2,340,000
9600
t2.
2340
x1000
13.
94
X6
564
800
70
56,000
t4.
76
X9
684
15.3 .509 1527
16.7. 806 s642
L7.7(9229\ 64,603
LB. 4(7867) 3l,46rl
r9. 90(53) 4770
20. 60(78) 4680
2r. (47)(85) 3sss
22. (34)(87) 2e5B
4l
'l.5
Exercrse
Set
23.
x
640
72
24,
x
46,080
27.
509
X4OB
6428
x3224
24.
32.
20,723,872
35.
5006
x4008
36.
20,064,048
39.
876
x345
25.
x
432
x375
29.
798,408
8928
x3I72
x
28,319,616
362,t28
6789
x2330
37.
355
x299
43.
X
26.
X
30.
41.
7889
x6224
346
x650
224.900
3482
104
5608
x4500
509
88
44,792
6408
x6064
3 B , 8 5 BI ,1 2
38.
2s,236,000
106,145
E
853
x936
162,000
I5,818,370
40.
444
33
t4,652
59,829
207.672
31.
777
77
4560
x7890
35,978,400
42.
49,101,136
6501
x3449
22,42t,949
Estimate the product by first rounding to the nearest ten. Show your work.
45
67
44.
50. 70:3500
51
x78
45.
34
x29
46.
3 0. 3 0: 9 0 0
50.80:4000
63
x54
6 0. 5 0: 3 0 0 0
o
Estimate the product by first rounding to the nearest hundred. Show your work.
47,
876
x345
9 0 0. 3 0 0: 2 7 0 , 0 0 0
48.
355
x299
4 0 0. 3 0 0 : 1 2 0 , 0 0 0
49.
432
x199
400.200-80,000
o
50.
789
x434
8 0 0. 4 0 0: 3 2 0 , 0 0 0
N
o
(J
42
CHAPIER
l: WholeNumbers
51. ToyotaSienna. A pharmaceuticalcompany buys a
ToyotaSiennafor each ofits 112salesreDresentatives.
Each car costsg27,896plus an additional g540per car
in destinationcharges.
a) Estimatethe total cost of the purchaseby rounding
the cost ofeach car,the destination charge,and the
number of salesrepresentativesto the nearest
hundred. $2,840,000
b) Estimatethe total cost of the purchaseby rounding
the cost of each car to the nearestthousand and the
destinationchargeand the number of reps to the
nearesthundred. $2,850,000
52. A travel club of 176people decidesto fly from Los
Angelesto Tokyo.The cost of a round-trip ticket is $643.
a) Estimatethe total cost of the trip by rounding the
cost of the airfare and the number of travelers to the
nearestten. $115,200
b) Estimatethe total cost of the trip by rounding the
cost of the airfareand the number of travelersto the
nearesthundred. $120,000
Source: Toyota
H
Findthe areaofeachregion.
53.
5 2 9 , 9 8 4s q m i
129 yd
ti385 sq yd
728 mi
72Bmi
tB sq ft
t 2 t s qy d
1 1y d
7mi
1 1y d
1 4 4s q c m
59. F 3 m m
4693 sq mi
48 mm
l6 cm
I44 sq ntm
1 9m i
9cm
43
Exercise
Setl.5
61. Find the areaof thb region formed by the baselines on a
Major LeagueBaseballdiamond.
62. Find the areaof a standard-sizedhockev rink.
k-zooft
-------i\
17,000sq ft
Bl00 sq ft
63. Dyy Describe a situation that corresponds to each
multiolication: 4 . $150:$4 . 150.
64. DW Explain the multiplication illustrated in the
diagram below.
,
3.5
r5,r_!___-r
,l
5,1
ffi
Add. tl.2bl
65.
4908
5667
+2110
66.
987
87
7
+
b
3 4 0,7 9B
B 6,6 79
427,477
68.
B 8,7 7 7
+22,333
I I 1,110
10,u:14
Subtract.[1.3d]
4908
-3667
67.
o
r,
l2,6Bs
69.
o
70.
124r
9B 76
9 8 7 B8B9
73. Round 6,375,602to the nearestthousand. [1.4a]
6.376.000
75. DW \ /hat do the commutative laws of addition and
multiplication have in common?
71.
3 4 0,7 I B
72. 8 8,7 7 7
- 2 2 , 3 3 3 66.444
254,119
86,679
74. Round 6,375,602to the nearestten.
[1.4a]
6.375.600
76. DW Explain how the distributive law differs from the
associativelaw.
77. ffi An l8-story office building is box-shaped. Each floor measures I72 ftby B ft with a 20-ft by 35-ft rectangular area lost to
an elevator,Iobby, and stairwell. How much area is available as office space? 247,464sqft
78. Computer Printers. Eva prints a 5 in. by 7 in. photo on
her EpsonR1800printer (seeExercise6). How many dots
will be printed when the printer produces the photo?
290,304,000
dots
44
CHAPIER
l: WholeNumbers
79. Compttter Printers. Adam's HP 8250 is printing an
B in. by 10 in. photo (seeExercise5). How many dots
will be printed when the printer finishes the photo?
460.800.000
dots
o
(J