FRACTIONS QUIZ

Quiz

Fractions

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Question 1/5

A. 1 8/21

B. 9/21

C. 3/7

D. 7/10

2/3 + 5/7

Rightanswer!

These are unlike fractions, but you can find a least common denominator of 21 by multiplying the denominators by eachother. You must simplify after you add by dividing the improper fraction.

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Question 2/5

3/4 + 2/3

A. 1 5/12

B. 6/7

C. 1/12

D. 12/17

rightanswer

These are unlike fractions, but you can make equivalent fractions with a least common denominator of 12. When you add, you get 17/12, and divide to simplify.

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Question 3/5

7/8- 1/2

A. 8/10

B. 4/5

C. 3/8

D. 1/3

Rightanswer!

Always pay attention to the sign! 1/2 is equivalent to 4/8, so you can subtract the numerators and keep the denominators the same. 7/8-4/8=3/8. Because 3 and 8 have no common factors, it is already simplified!

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Question 4/5

You have 3 1/2 pounds of legos, and buy 7/10 pounds more. How many pounds of legos do you have in all?

A. 4 pounds

B. 2 8/10 pounds

C. 4 2/8 pounds

D. 4 1/5 pounds

rightanswer

First, turn your mixed number into an improper fraction by multiplying the whole number by the denominator, adding the numerator, and keeping the denominator the same.

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Question 5/5

A rope is 3 2/3 feet long. You cut off 1 1/6 feet. How long is the rope now?

A. 2 1/2 ft

B. 4 5/6 ft

C. 3 ft

D. 2 2/3 ft

rightanswer!

Remember to always turn your mixed numbers into improper fractions. Subtract after you find equivalent fractions! When you get 2 3/6, 3 and 6 have a common factor of 2, and you can divide numerator and denominator by 2 to get 1/2. Don't forget your whole number!

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