Page 77 - Basic College Mathematics with Early Integers

54 C HAPTE R 1 I THE WHOLE NUMBERS

PRACTICE 12 Example 12 Budgeting Money

Ken Shimura purchased DVDs
Suzanne Scarpulla and a friend plan to take their children to the Georgia
and CDs through a club. Each
Aquarium in Atlanta, the world’s largest aquarium. The ticket price for each child
DVD was priced at $11 and
is $22 and for each adult, $26. If five children and two adults plan to go, how much
each CD cost $9. Ken bought
money is needed for admission? (Source: GeorgiaAquarium.org)
eight DVDs and five CDs. Find
the total cost of the order. Solution: If the price of one child’s ticket is $22, the price for 5 children is
5 * 22 = $110. The price of one adult ticket is $26, so the price for two adults
is 2 * 26 = $52. The total cost is:
In Words Translate to Numbers
price of 5 children : 110
+ cost of 2 adults : + 52
total cost 162

The total cost is $162.

Work Practice 12

PRACTICE 13 Example 13 Estimating Word Count
If an average page in a book The average page of a book contains 259 words. Estimate, rounding each number
contains 163 words, estimate, to the nearest hundred, the total number of words contained on 212 pages.
rounding each number to the Solution:
nearest hundred, the total The exact number of words is 259 * 212 . Estimate this product by
rounding each factor to the nearest hundred.
number of words contained on
391 pages. 259 rounds to 300
300 * 200 = 60,000
* 212 rounds to * 200 , ˆ
#
3 2 = 6

There are approximately 60,000 words contained on 212 pages.
Work Practice 13

Calculator Explorations Multiplying Numbers

To multiply numbers on a calculator, find the keys marked Use a calculator to multiply.
#
* and = or ENTER . For example, to find 31 66 1. 72 * 48 2. 81 * 92
#
#
on a calculator, press the keys 31 * 66 = or 3. 163 94 4. 285 144
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5. 983(277) 6. 1562(843)
ENTER . The display will read 2046 . Thus,
#
31 66 = 2046.

Answers
12. $133 13. 80,000 words