Subtract 72/70 from 7/9, Solve 7/9 - 1 2/70 as a fraction

Subtract 72/70 from 7/9

1^st number: 7/9, 2^nd number: 1 2/70

7/9 - 72/70 is -79/315.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 9 × 70 = 630,
7/9 = 7 × 70/9 × 70 = 490/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
72/70 = 72 × 9/70 × 9 = 648/630
Subtract the two like fractions:
490/630 - 648/630 = 490 - 648/630 = -158/630
After reducing the fraction, the answer is -79/315

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