Glencoe Math: Course 1, Volume 1
GM
Glencoe Math: Course 1, Volume 1 View details
6. Estimate with Percents
Continue to next subchapter

Exercise 9 Page 141

Practice makes perfect
To win a prize, Angel needs to make 7 out of 15 baskets. We want to determine whether he wins a prize if he makes 40 % of his shots. Let's find 40 % of 15. First, we will rewrite 40 % as a fraction by writing the number part as a numerator over 100. 40 % = 40/100Let's simplify the fraction by dividing the numerator and the denominator by 20.
40/100
40÷ 20/100÷ 20
2/5
Now let's calculate 25 of 15. To multiply a fraction by 15, we multiply the numerator by 15 and keep the denominator. Let's do it!
2/5 * 15
2 * 15/5
30/5
6
We found that Angel makes 6 out of 15 baskets. He needs to makes at least 7 to win a prize. This means that he does not win a prize if he makes 40 % of his shots.
We know that Angel is shooting the baskets. To win a prize, he needs to make 7 of 15 baskets. We want to estimate the percent of the baskets that need to be made in order to win a prize. Let's start by writing 7 out of 15 as a fraction. 7/15 Let's multiply the numerator and the denominator of the fraction by 2.
7/15
7* 2/15 * 2
14/30
Since 30 is divisible by 15, let's round 14 to 15 and simplify the fraction. 14/30 ≈ 15/30 Let's simplify it.
15/30
15÷ 15/30÷ 15
1/2
Finally, let's rewrite 12 as a percent. We need to find an equivalent fraction with the denominator of 100. We multiply 2 by 50 to get 100, so we will also multiply 1 by 50 to get an equivalent fraction.
Finally, let's write 50100 as a percent by writing the numerator and the percent symbol. 50/100 = 50 % We found that about 50 % of the baskets need to be made in order to win a prize.