Subtract 9/90 from 9/42, Solve 9/42

Subtract 9/90 from 9/42

9/42 - 9/90 is 4/35.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 42 × 15 = 630,
9/42 = 9 × 15/42 × 15 = 135/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
9/90 = 9 × 7/90 × 7 = 63/630
Subtract the two like fractions:
135/630 - 63/630 = 135 - 63/630 = 72/630
After reducing the fraction, the answer is 4/35

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