Practice the questions of McGraw Hill Math Grade 8 Answer Key PDF Lesson 6.6 Percents and Fractions to secure good marks & knowledge in the exams.
McGraw-Hill Math Grade 8 Answer Key Lesson 6.6 Percents and Fractions
Exercises Calculate Using Multiplication
Question 1.
18 is ____ % of 60
Answer:
30%,
Explanation:
18 is x% of 60 is 18 = \(\frac{x}{100}\) X 60, x = \(\frac{18 X 100}{60}\), x = \(\frac{1800}{60}\).
So x = 30.
Question 2.
20% of 85 is ___________
Answer:
17,
Explanation:
20% of 85 is x = \(\frac{20}{100}\) X 85, x = \(\frac{20 X 85}{100}\),
x = \(\frac{1700}{100}\), x = 17.
Question 3.
\(\frac{42}{70}\) = ____ %
Answer:
60%,
Explanation:
Let x = \(\frac{42}{70}\), 70 x = 42, x = \(\frac{42}{70}\), x = 0.6,
Multiply with 100 to convert into percentage
0.6 x 100% = 60%.
Question 4.
30% of 90 is ___________
Answer:
27,
Explanation:
30% of 90 is \(\frac{30}{100}\) X 90, Let x = \(\frac{30 X 90}{100}\),
x = \(\frac{2700}{100}\), x = 27.
Question 5.
\(\frac{16}{128}\) = ____ %
Answer:
12.5%,
Explanation:
\(\frac{16}{128}\) = x%, 128x = 16, x = \(\frac{16}{128}\),
x = 0.125, Multiply with 100 to convert into percentage 0.125 x 100% = 12.5%.
Question 6.
\(\frac{12}{48}\) = ____ %
Answer:
25%,
Explanation:
Let x = \(\frac{12}{48}\), 48x = 12, x = \(\frac{12}{48}\),
x = 0.25,
Multiply with 100 to convert into percentage 0.25 x 100% = 25%.
Question 7.
15% of 60 is __________
Answer:
9,
Explanation:
Let 15% of 60 is \(\frac{15}{100}\) X 60,
x = \(\frac{15 X 60}{100}\),
x = \(\frac{900}{100}\), x = 9.
Question 8.
\(\frac{24}{160}\) = ____ %
Answer:
15%,
Explanation:
Let x = \(\frac{24}{160}\), 160x = 24,
x = \(\frac{24}{160}\),
x = 0.15, Multiply with 100 to convert into percentage 0.15 x 100% = 15%.
Question 9.
35% of 220 is ____
Answer:
77,
Explanation:
Let x = 35% of 220 is \(\frac{35}{100}\) X 220,
\(\frac{35 X 220}{100}\) = x,
\(\frac{7700}{100}\) = x, x = 77.
Question 10.
1\(\frac{1}{5}\) = ____ %
Answer:
120%,
Explanation:
1\(\frac{1}{5}\) = x%, \(\frac{6}{5}\) = x%, 5x = 6,
x = \(\frac{6}{5}\), x = 1.2,
Multiply with 100 to convert into percentage
1.2 x 100% = 120%.
Question 11.
40% of 65 is ____
Answer:
26%,
Explanation:
40% of 65 is \(\frac{40}{100}\) X 65,
Let x = \(\frac{40 X 65}{100}\) = x,
\(\frac{2600}{100}\) = x, x = 26.
Question 12.
\(\frac{75}{250}\) = ____ %
Answer:
30%,
Explanation:
\(\frac{75}{250}\) = x%, 200x = 75,
x = \(\frac{75}{250}\), x = 0.3,
Multiply with 100 to convert into percentage is 0.3 x 100 = 30%.
Question 13.
\(\frac{3}{50}\) = ____ %
Answer:
6%,
Explanation:
\(\frac{3}{50}\) = x%, 50x = 3, x = \(\frac{3}{50}\),
x = 0.06,
Multiply with 100 to convert into percentage 0.06 x 100% = 6%.
Question 14.
\(\frac{55}{1100}\) = ____ %
Answer:
5%,
Explanation:
\(\frac{55}{1100}\) = x%, 1100x = 55, x = \(\frac{55}{1100}\),
x = 0.05, Multiply with 100 to convert into percentage 0.05 x 100 = 5%.
Question 15.
65% of 40 is ____
Answer:
26,
Explanation:
65% of 40 is \(\frac{65}{100}\) X 40 = x,
\(\frac{65 X 40}{100}\) = x,
\(\frac{2600}{100}\) = x,
x = 26.