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 _____

Answer:

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 ___________

Answer:

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

Answer:

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 ___________

Answer:

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 _____

Answer:

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

Answer:

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 __________

Answer:

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 ____

Answer:

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

Answer:

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 __________

Answer:

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 ___________

Answer:

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

Answer:

37.5%

Explanation:

12 is x% of 32,

12 = \(\frac{x}{100}\) X 32

x = \(\frac{12 X 100}{32}\)

\(\frac{1200}{32}\)

x = 37.5