Subtract 35/45 from 9/21, Solve 9/21

Subtract 35/45 from 9/21

9/21 - 35/45 is -22/63.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 45 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 21 × 15 = 315,
9/21 = 9 × 15/21 × 15 = 135/315
Likewise, for the 2nd fraction, since 45 × 7 = 315,
35/45 = 35 × 7/45 × 7 = 245/315
Subtract the two like fractions:
135/315 - 245/315 = 135 - 245/315 = -110/315
After reducing the fraction, the answer is -22/63

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