# McGraw Hill Math Grade 8 Lesson 6.4 Answer Key Proportions and Percent

Practice the questions of McGraw Hill Math Grade 8 Answer Key PDF Lesson 6.4 Proportions and Percent to secure good marks & knowledge in the exams.

## McGraw-Hill Math Grade 8 Answer Key Lesson 6.4 Proportions and Percent

Exercises Calculate Using Proportions

Question 1.
40% of 50 is _____
20,

Explanation:
40% of 50 is,
$$\frac{40}{100}$$ X 50 = x
$$\frac{40 X 50}{100}$$ = x
$$\frac{2000}{100}$$ = x
x = 20

Question 2.
72 is 18% of ___________
400,

Explanation:
72 is 18% of,
72 X $$\frac{18}{100}$$ = x
$$\frac{72 X 100}{18}$$ = x
$$\frac{7200}{18}$$ = x
x = 400

Question 3.
14 is ________% of 35
40%,

Explanation:
14 is x% of 35,
14 = $$\frac{x}{100}$$ X 35
x = $$\frac{14 X 100}{350}$$
x = $$\frac{1400}{35}$$
x = 40

Question 4.
12% of 85 is ___________
10.2,

Explanation:
12% of 85 is,
$$\frac{12}{100}$$ X 85 = x
$$\frac{12 X 85}{100}$$ = x
$$\frac{1020}{100}$$ = x
x = 10.2

Question 5.
50 is 40% of _____
125,

Explanation:
50% of 40 is,
$$\frac{50}{100}$$ X 40 = x
$$\frac{50 X 100}{40}$$ = x
$$\frac{5000}{40}$$ = x
x = 125

Question 6.
18 is ________% of 270
6.7%,

Explanation:
18 is x% of 270,
18 = $$\frac{x}{100}$$ X 270
x = $$\frac{18 X 100}{270}$$
x = $$\frac{1800}{270}$$
x = 6.7%

Question 7.
70% of 70 is __________
49,

Explanation:
70% of 70 is,
$$\frac{70}{100}$$ X 70 = x
$$\frac{70 X 70}{100}$$ = x
$$\frac{4900}{100}$$ = x
x = 49

Question 8.
66 is 30% of ____
220,

Explanation:
66 is 30% of,
$$\frac{30}{100}$$ X 66 = x
$$\frac{66 X 100}{30}$$ = x
$$\frac{6600}{30}$$ = x
x = 220

Question 9.
1.5 is ________% of 75
2%,

Explanation:
1.5 is x% of 75,
1.5 = $$\frac{x}{100}$$ X 75
x = $$\frac{1.5 X 100}{75}$$
x = $$\frac{150}{75}$$
x = 2

Question 10.
140% of 95 is __________
133,

Explanation:
140% of 95 is,
$$\frac{140}{100}$$ X 95 = x
$$\frac{140 X 95}{100}$$ = x
$$\frac{13300}{100}$$ = x
x = 133

Question 11.
13 is 65% of ___________
20,

Explanation:
13 is 65% of,
13 X $$\frac{65}{100}$$ = x
$$\frac{13 X 100}{65}$$ = x
$$\frac{1300}{65}$$ = x
x = 20

Question 12.
12 is ___ % of 32
12 = $$\frac{x}{100}$$ X 32
x = $$\frac{12 X 100}{32}$$
$$\frac{1200}{32}$$