Math quiz help?

solve each prolbem. write all answers in simplest form.

21. 2/3-1/4 22. 4/9+1/3

23. 2 3/7 24. 4 1/3-1 2/3

24. 4 1/3- 1 2/3

26. 2 7/8-1 1/4

27. 1/2 times 48

28. 1/2 times 3/4

29. 3/4 times 1/3

Math quiz help?

21. 2/3-1/4

= 8/12 - 3/12

= 5/12

22. 4/9+1/3

=4/9 + 3/9

= 7/9

23. 2 3/7 (what's the question here?)

24. 4 1/3- 1 2/3

= 3 4/3 - 1 2/3

= 2 2/3

26. 2 7/8-1 1/4

=2 7/8 - 1 2/8

= 1 5/8

27. 1/2 times 48

= 48/ 2

= 24

28. 1/2 times 3/4

= 3/8

29. 3/4 times 1/3

=3/12

=1/4

Rule:

Addition- add the numerator and copy the denominator if they are similar fractions.

-if dissimilar fractions, get LCD and add

Subtraction - subtract the numerator and copy the denominator if they are similar fractions.

-if dissimilar fractions, get LCD and subtact

Multiplication - multiply numerator and numerator and denominator by denominator

Division - get the reciprocal of the second fraction and proceed to the rule in multiplication

(NOTE: the answer is always in the simplest form by getting the GCF of numerator and denominator)

Math quiz help?

2/3 - 1/4 = you have to make the denominators the same to subtract - lowest common denom is 12

so multiply 2/3 times 4/4 and 1/4 times 3/3

8/12-3/12 = 5/12

now you do your own homework - I know how to do it - that is why YOU have the homework!