first if the denominators are similar then we just add the numerator
ex : 3/5 + 6/5
here the denominators are similar then total is (3+6)/5=9/5
ex 2: 12/7 + 5/7= 17/7
ex3: 6/5 - 7/5= -1/5
second if the denominators are not similar then we should make Unification denominators before make the operation
ex : 3/2 + 5/3 =
( (6/2)× 3 + (6/3) × 2 ) /(2 ×3)= ( 4 + 9 ) / 6 = 13 / 6
ex: 5/6 - 7/8 =
((40/6)× 5 - (40/8) × 7) / ( 6×8)= ( 48 - 35 ) / 40 =13 / 40
very easy
enjoy
mr Hesham
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