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

Subtract 5/42 from 20/5

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

20/5 - 5/42 is 163/42.

Find the least common denominator or LCM of the two denominators:
LCM of 5 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 5 × 42 = 210,
20/5 = 20 × 42/5 × 42 = 840/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
5/42 = 5 × 5/42 × 5 = 25/210
Subtract the two like fractions:
840/210 - 25/210 = 840 - 25/210 = 815/210
After reducing the fraction, the answer is 163/42
In mixed form: 337/42

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