4/5-2/3=?
Find the least common denominator of 5 and 3 so that you can convert the two fractions to fractions that have the same denominator, then you can subtract them. Repost if you still have trouble.
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The LCD of 4/5 and 2/3 is found by multiplying 5 x 3 gving 15.
4/5 = 12/15
2/3 = 10/15
12/15 - 10/15 = 2/15 (answer)