Subtract 30/72 from 40/12, Solve 3 4/12

Subtract 30/72 from 40/12

1^st number: 3 4/12, 2^nd number: 30/72

40/12 - 30/72 is 35/12.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 72 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 12 × 6 = 72,
40/12 = 40 × 6/12 × 6 = 240/72
Likewise, for the 2nd fraction, since 72 × 1 = 72,
30/72 = 30 × 1/72 × 1 = 30/72
Subtract the two like fractions:
240/72 - 30/72 = 240 - 30/72 = 210/72
After reducing the fraction, the answer is 35/12
In mixed form: 211/12

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