Subtract 60/21 from 84/40, Solve 2 4/40

Subtract 60/21 from 84/40

1^st number: 2 4/40, 2^nd number: 2 18/21

84/40 - 60/21 is -53/70.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 40 × 21 = 840,
84/40 = 84 × 21/40 × 21 = 1764/840
Likewise, for the 2nd fraction, since 21 × 40 = 840,
60/21 = 60 × 40/21 × 40 = 2400/840
Subtract the two like fractions:
1764/840 - 2400/840 = 1764 - 2400/840 = -636/840
After reducing the fraction, the answer is -53/70

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