Subtract 9/84 from 10/40, Solve 10/40

Subtract 9/84 from 10/40

10/40 - 9/84 is 1/7.

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,
10/40 = 10 × 21/40 × 21 = 210/840
Likewise, for the 2nd fraction, since 84 × 10 = 840,
9/84 = 9 × 10/84 × 10 = 90/840
Subtract the two like fractions:
210/840 - 90/840 = 210 - 90/840 = 120/840
After reducing the fraction, the answer is 1/7

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