Subtract 1/40 from 9/84, Solve 9/84

Subtract 1/40 from 9/84

9/84 - 1/40 is 23/280.

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

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 84 × 10 = 840,
9/84 = 9 × 10/84 × 10 = 90/840
Likewise, for the 2nd fraction, since 40 × 21 = 840,
1/40 = 1 × 21/40 × 21 = 21/840
Subtract the two like fractions:
90/840 - 21/840 = 90 - 21/840 = 69/840
After reducing the fraction, the answer is 23/280

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