Subtract 3/42 from 20/4, Solve 5 0/4

Subtract 3/42 from 20/4

1^st number: 5 0/4, 2^nd number: 3/42

20/4 - 3/42 is 69/14.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 42 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 4 × 21 = 84,
20/4 = 20 × 21/4 × 21 = 420/84
Likewise, for the 2nd fraction, since 42 × 2 = 84,
3/42 = 3 × 2/42 × 2 = 6/84
Subtract the two like fractions:
420/84 - 6/84 = 420 - 6/84 = 414/84
After reducing the fraction, the answer is 69/14
In mixed form: 413/14

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