Subtract 9/70 from 3/72, Solve 3/72

Subtract 9/70 from 3/72

3/72 - 9/70 is -73/840.

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 72 × 35 = 2520,
3/72 = 3 × 35/72 × 35 = 105/2520
Likewise, for the 2nd fraction, since 70 × 36 = 2520,
9/70 = 9 × 36/70 × 36 = 324/2520
Subtract the two like fractions:
105/2520 - 324/2520 = 105 - 324/2520 = -219/2520
After reducing the fraction, the answer is -73/840

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