math quiz help?

Question

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

this is my little brothers im doing my own

23 is 2 3/7 +1 4/7

Answer 1

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)

Answer 2

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!