# Addition and Substraction of Fractions

This is for OTA #101733 only?

1. Find the LCM of 16 and 40.

____a. 40

__x_b. 80

____c. 120

____d. 640

2. Add and Simplify: 4/5+3/4

____a. 7/20

____b. 7/9

_x__c. 31/20

____d. 17/9

3. Subtract and simplify: 8/15-2/9

_x__a. 2/45

____b. 16/135

____c. 40/135

____d. 14/45

4. Which of the following statements is true?

____a. 3/5>1/2

____b. 1/2<4/9

____c. 5/11>1/2

__x_d. 1/2>5/8

5. Solve: x + 3/8=5/12

____a. 10/9

____b. 19/24

____c. 5/32

_x__d. 1/24

6. Convert 9 2/3 to fraction notation.

____a. 4/3

____b. 14/3

____c. 21/3

_x__d. 29/3

7. Divde: 7/2138

____a. 302 6/7

__x_b. 305 3/7

____c. 315 6/7

____d. 350 3/7

8. Add: 8 3/4 + 1 1/6

____a. 9 1/12

____b. 9 1/3

____c. 9 2/5

_x__d. 9 11/12

9. Subtract: 8 1/2 - 4 2/5

____a. 4 9/10

_x__b. 4 1/10

____c. 3 9/10

____d. 3 1/5

10. Dustin worked 6 4/5 hours on Monday and 7 3/4 hours on Tuesday. How many hours did he work on those two days?

____a. 13 9/20 hours

_x__b. 13 7/9 hours

____c. 14 2/9 hours

____d. 14 11/20 hours

11. Subtract: 98 - 16 2/3

____a. 82 2/3

____b. 81 2/3

_x__c. 81 1/3

____d. 80 2/3

12. Greg needs 234 ft. of baseboard to finish trimming the floors in his house. He has 145 3/4 ft. of baseboard. How much baseboard does he need to buy?

__x_a. 88 1/4 ft.

____b. 89 3/4 ft.

____c. 90 1/4 ft.

____d. 90 3/4 ft.

13. Multiply: 18 x 5/6

____a. 21 3/10

____b. 18

__x_c. 15

____d. 1 2/3

14. Multiply: 4 3/8 x 2 1/5

_x__a. 9 5/8

____b. 9 7/40

____c. 8 3/40

____d. 6 23/40

15. Divide: 1 2/5 divid 21

____a. 1/15

____b. 1 2/105

_x__c. 15

____d. 29 2/5

16. A pizza dough recipe calls for 2 1/2 cups of flour. How much flour is needed for 4 recipes?

____a. 8 cups

____b. 9 cups

_x__c. 10 cups

____d. 11 cups

17. An order of books weighs 36 lb. Each book weighs 1 1/3 lb. How many books are in the order?

____a. 12 books

____b. 27 books

____c. 30 books

__x_d. 48 books

18. Simplify: 5/8 + 2 1/3 x 3 1/4

____a. 8 5/24

____b. 7 5/24

__x_c. 3 7/8

____d. 5/16

19. Find the average of 1/4, 3/8, and 5/6 ( this one is kinda difficult, show formula)

____a. 4 3/8

____b. 1 41/64

_x__c. 1 11/24

____d. 35/72

20. Estimate 16 20/21 x 28 3/7 - 4 13/25 + 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2. (this one is kinda difficult, show formula)

____a. 452

____b. 480

____c. 488

__x_d. 492 1/2

https://brainmass.com/math/fractions-and-percentages/addition-and-substraction-of-fractions-45002