Subtract 3/21 from 40/2, Solve 20 0/2

Subtract 3/21 from 40/2

1^st number: 20 0/2, 2^nd number: 3/21

40/2 - 3/21 is 139/7.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 2 × 21 = 42,
40/2 = 40 × 21/2 × 21 = 840/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
3/21 = 3 × 2/21 × 2 = 6/42
Subtract the two like fractions:
840/42 - 6/42 = 840 - 6/42 = 834/42
After reducing the fraction, the answer is 139/7
In mixed form: 196/7

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