Subtract 3/21 from 2/80, Solve 2/80

Subtract 3/21 from 2/80

2/80 - 3/21 is -33/280.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 21 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
2/80 = 2 × 21/80 × 21 = 42/1680
Likewise, for the 2nd fraction, since 21 × 80 = 1680,
3/21 = 3 × 80/21 × 80 = 240/1680
Subtract the two like fractions:
42/1680 - 240/1680 = 42 - 240/1680 = -198/1680
After reducing the fraction, the answer is -33/280

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