1.) 7/9+5/12
find the LCM of 9 and 12
LCM= 36
(7/9 x 4/4) + (5/12 x 3/3)
28/36+15/36
= 43/36
Divide 43 by 36 to make it a mixed fraction
1 7/36
2.) 21/24 - 3/8
find LCM of 24 and 8
LCM = 24
(21/24 x 1/1)+ (3/8 x 3/3)
21/24 + 9/24
30/24
Divide 30 by 24 to make it mixed fraction
= 1 6/24
Hope it helps
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