Subtract 72/70 from 27/72, Solve 27/72

Subtract 72/70 from 27/72

1^st number: 27/72, 2^nd number: 1 2/70

27/72 - 72/70 is -183/280.

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,
27/72 = 27 × 35/72 × 35 = 945/2520
Likewise, for the 2nd fraction, since 70 × 36 = 2520,
72/70 = 72 × 36/70 × 36 = 2592/2520
Subtract the two like fractions:
945/2520 - 2592/2520 = 945 - 2592/2520 = -1647/2520
After reducing the fraction, the answer is -183/280

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