Subtract 9/12 from 84/40, Solve 2 4/40

Subtract 9/12 from 84/40

1^st number: 2 4/40, 2^nd number: 9/12

84/40 - 9/12 is 27/20.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 40 × 3 = 120,
84/40 = 84 × 3/40 × 3 = 252/120
Likewise, for the 2nd fraction, since 12 × 10 = 120,
9/12 = 9 × 10/12 × 10 = 90/120
Subtract the two like fractions:
252/120 - 90/120 = 252 - 90/120 = 162/120
After reducing the fraction, the answer is 27/20
In mixed form: 17/20

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