Subtract 20/56 from 1/45, Solve 1/45

Subtract 20/56 from 1/45

1/45 - 20/56 is -211/630.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 56 is 2520

Next, find the equivalent fraction of both fractional numbers with denominator 2520
For the 1st fraction, since 45 × 56 = 2520,
1/45 = 1 × 56/45 × 56 = 56/2520
Likewise, for the 2nd fraction, since 56 × 45 = 2520,
20/56 = 20 × 45/56 × 45 = 900/2520
Subtract the two like fractions:
56/2520 - 900/2520 = 56 - 900/2520 = -844/2520
After reducing the fraction, the answer is -211/630

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