Subtract 80/70 from 10/9, Solve 1 1/9

Subtract 80/70 from 10/9

1^st number: 1 1/9, 2^nd number: 1 10/70

10/9 - 80/70 is -2/63.

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,
10/9 = 10 × 70/9 × 70 = 700/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
80/70 = 80 × 9/70 × 9 = 720/630
Subtract the two like fractions:
700/630 - 720/630 = 700 - 720/630 = -20/630
After reducing the fraction, the answer is -2/63

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