Subtract 80/21 from 96/30, Solve 3 6/30

Subtract 80/21 from 96/30

1^st number: 3 6/30, 2^nd number: 3 17/21

96/30 - 80/21 is -64/105.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 30 × 7 = 210,
96/30 = 96 × 7/30 × 7 = 672/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
80/21 = 80 × 10/21 × 10 = 800/210
Subtract the two like fractions:
672/210 - 800/210 = 672 - 800/210 = -128/210
After reducing the fraction, the answer is -64/105

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