Subtract 2/80 from 25/21, Solve 1 4/21

Subtract 2/80 from 25/21

1^st number: 1 4/21, 2^nd number: 2/80

25/21 - 2/80 is 979/840.

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

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 21 × 80 = 1680,
25/21 = 25 × 80/21 × 80 = 2000/1680
Likewise, for the 2nd fraction, since 80 × 21 = 1680,
2/80 = 2 × 21/80 × 21 = 42/1680
Subtract the two like fractions:
2000/1680 - 42/1680 = 2000 - 42/1680 = 1958/1680
After reducing the fraction, the answer is 979/840
In mixed form: 1139/840

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