Question

name ____________________________ date ______ period ____
lesson 1 extra practice
percent of a number
find each number. round to the nearest tenth if necessary.

1. 5% of 40\t\t\t2. 10% of 120\t\t\t3. 12% of 150

1. 12.5% of 40\t\t\t5. 75% of 200\t\t\t6. 13% of 25.3

1. 250% of 44\t\t\t8. 0.5% of 13.7\t\t\t9. 600% of 7

1. 1.5% of 25\t\t\t11. 81% of 134\t\t\t12. 43% of 110

1. 61% of 524\t\t\t14. 100% of 3.5\t\t\t15. 20% of 58.5

1. 45% of 125.5\t\t\t17. 23% of 500\t\t\t18. 80% of 8

1. 90% of 72\t\t\t20. 32% of 54\t\t\t21. 15% of 75

Explanation:

Step1: Convert % to decimal

To find a percent of a number, first convert the percentage to a decimal by dividing by 100.

Step2: Multiply by the number

Multiply the decimal value by the given number. Round to the nearest tenth if needed.

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1. 5% of 40

Step1: Convert 5% to decimal

$5\% = \frac{5}{100} = 0.05$

Step2: Multiply by 40

$0.05 \times 40 = 2$

2. 10% of 120

Step1: Convert 10% to decimal

$10\% = \frac{10}{100} = 0.1$

Step2: Multiply by 120

$0.1 \times 120 = 12$

3. 12% of 150

Step1: Convert 12% to decimal

$12\% = \frac{12}{100} = 0.12$

Step2: Multiply by 150

$0.12 \times 150 = 18$

4. 12.5% of 40

Step1: Convert 12.5% to decimal

$12.5\% = \frac{12.5}{100} = 0.125$

Step2: Multiply by 40

$0.125 \times 40 = 5$

5. 75% of 200

Step1: Convert 75% to decimal

$75\% = \frac{75}{100} = 0.75$

Step2: Multiply by 200

$0.75 \times 200 = 150$

6. 13% of 25.3

Step1: Convert 13% to decimal

$13\% = \frac{13}{100} = 0.13$

Step2: Multiply by 25.3

$0.13 \times 25.3 = 3.289 \approx 3.3$

7. 250% of 44

Step1: Convert 250% to decimal

$250\% = \frac{250}{100} = 2.5$

Step2: Multiply by 44

$2.5 \times 44 = 110$

8. 0.5% of 13.7

Step1: Convert 0.5% to decimal

$0.5\% = \frac{0.5}{100} = 0.005$

Step2: Multiply by 13.7

$0.005 \times 13.7 = 0.0685 \approx 0.1$

9. 600% of 7

Step1: Convert 600% to decimal

$600\% = \frac{600}{100} = 6$

Step2: Multiply by 7

$6 \times 7 = 42$

10. 1.5% of 25

Step1: Convert 1.5% to decimal

$1.5\% = \frac{1.5}{100} = 0.015$

Step2: Multiply by 25

$0.015 \times 25 = 0.375 \approx 0.4$

11. 81% of 134

Step1: Convert 81% to decimal

$81\% = \frac{81}{100} = 0.81$

Step2: Multiply by 134

$0.81 \times 134 = 108.54$

12. 43% of 110

Step1: Convert 43% to decimal

$43\% = \frac{43}{100} = 0.43$

Step2: Multiply by 110

$0.43 \times 110 = 47.3$

13. 61% of 524

Step1: Convert 61% to decimal

$61\% = \frac{61}{100} = 0.61$

Step2: Multiply by 524

$0.61 \times 524 = 319.64$

14. 100% of 3.5

Step1: Convert 100% to decimal

$100\% = \frac{100}{100} = 1$

Step2: Multiply by 3.5

$1 \times 3.5 = 3.5$

15. 20% of 58.5

Step1: Convert 20% to decimal

$20\% = \frac{20}{100} = 0.2$

Step2: Multiply by 58.5

$0.2 \times 58.5 = 11.7$

16. 45% of 125.5

Step1: Convert 45% to decimal

$45\% = \frac{45}{100} = 0.45$

Step2: Multiply by 125.5

$0.45 \times 125.5 = 56.475 \approx 56.5$

17. 23% of 500

Step1: Convert 23% to decimal

$23\% = \frac{23}{100} = 0.23$

Step2: Multiply by 500

$0.23 \times 500 = 115$

18. 80% of 8

Step1: Convert 80% to decimal

$80\% = \frac{80}{100} = 0.8$

Step2: Multiply by 8

$0.8 \times 8 = 6.4$

19. 90% of 72

Step1: Convert 90% to decimal

$90\% = \frac{90}{100} = 0.9$

Step2: Multiply by 72

$0.9 \times 72 = 64.8$

20. 32% of 54

Step1: Convert 32% to decimal

$32\% = \frac{32}{100} = 0.32$

Step2: Multiply by 54

$0.32 \times 54 = 17.28$

21. 15% of 75

Step1: Convert 15% to decimal

$15\% = \frac{15}{100} = 0.15$

Step2: Multiply by 75

$0.15 \times 75 = 11.25$

Answer:

1. 2
2. 12
3. 18
4. 5
5. 150
6. 3.3
7. 110
8. 0.1
9. 42
10. 0.4
11. 108.54
12. 47.3
13. 319.64
14. 3.5
15. 11.7
16. 56.5
17. 115
18. 6.4
19. 64.8
20. 17.28
21. 11.25