(a)Which region had the largest share of Internet users? What was that share?
The sector for Asia is the largest, so Asia had the largest share of Internet users,
(b)Estimate the number of Internet users in North America.
A share of can be rounded to or and the total number of Internet users,
970 million, can be rounded to 1000 million (1 billion). We multiply by 1000. The
number of Internet users in North America would be about
(c) How many actual Internet users were there in North America?
We multiply the actual fraction from the graph for North America, by the
number of users, 970 million.
23
100
19702 =
23
100
#^970
1
=
22,310
100
= 223
1
10
23100 ,
1
4
110002 =250 million.
1
414 ,
25100 ,
23
100720.
10 CHAPTER 1 The Real Number System
This is reasonable,
given our estimate
in part (b).Thus, or 223,100,000 since million
people in North America used the Internet. NOW TRY
223 101 million, 1 101 = 101 #1,000,000 =100,000 2 ,
Complete solution available
on the Video Resources on DVD
1.1 EXERCISES
Concept Check Decide whether each statement is trueorfalse.If it is false, say why.1.In the fraction 5 is the numerator and
8 is the denominator.2.The mixed number equivalent of is
6 15.31
55
8 ,5.The fraction^1339 is in lowest terms. 6.The reciprocal of^62 is 13.3.The fraction is proper.^77 4.The number 1 is prime.7.The product of 10 and 2 is 12. 8.The difference between 10 and 2 is 5.Identify each number asprime, composite,orneither. If the number is composite, write it as
the product of prime factors. See Example 1.- 19 10. 31 11. 30 12. 50
- 64 14. 81 15. 1 16. 0
- 57 18. 51 19. 79 20. 83 21. 124
- 138 23. 500 24. 700 25. 3458 26. 1025
Write each fraction in lowest terms. See Example 2.32. 33. 34. 35. 36.
37.Concept Check Which choice shows the correct way to write in lowest terms?A. B.C. D.
16
24
=
14 + 2
21 + 3
=
2
3
16
24
=
8 # 2
8 # 3=
2
3
16
24
=
4 # 4
4 # 6=
4
6
16
24
=
8 + 8
8 + 16
=
8
16
=
1
2
16
24132
77
144
120
16
64
18
90
55
200
64
100
16
20
15
18
4
12
8
16
NOW TRY ANSWERS
- (a)other
(b)333 million
(c) million, or
339,500,000
(^339 12)
A 207 is about^13 .B
NOW TRY
EXERCISE 9
Refer to the circle graph in
FIGURE 2on the preceding page.
(a)Which region had the least
number of Internet users?
(b)Estimate the number of
Internet users in Asia.
(c)How many actual Internet
users were there in Asia?
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