Subtract 21/70 from 84/24, Solve 3 12/24

Subtract 21/70 from 84/24

1^st number: 3 12/24, 2^nd number: 21/70

84/24 - 21/70 is 16/5.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 70 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 24 × 35 = 840,
84/24 = 84 × 35/24 × 35 = 2940/840
Likewise, for the 2nd fraction, since 70 × 12 = 840,
21/70 = 21 × 12/70 × 12 = 252/840
Subtract the two like fractions:
2940/840 - 252/840 = 2940 - 252/840 = 2688/840
After reducing the fraction, the answer is 16/5
In mixed form: 31/5

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