Subtract 45/84 from 4/40, Solve 4/40

Subtract 45/84 from 4/40

4/40 - 45/84 is -61/140.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 40 × 21 = 840,
4/40 = 4 × 21/40 × 21 = 84/840
Likewise, for the 2nd fraction, since 84 × 10 = 840,
45/84 = 45 × 10/84 × 10 = 450/840
Subtract the two like fractions:
84/840 - 450/840 = 84 - 450/840 = -366/840
After reducing the fraction, the answer is -61/140

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