Subtract 70/9 from 7/70, Solve 7/70

Subtract 70/9 from 7/70

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

7/70 - 70/9 is -691/90.

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

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
7/70 = 7 × 9/70 × 9 = 63/630
Likewise, for the 2nd fraction, since 9 × 70 = 630,
70/9 = 70 × 70/9 × 70 = 4900/630
Subtract the two like fractions:
63/630 - 4900/630 = 63 - 4900/630 = -4837/630
After reducing the fraction, the answer is -691/90

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