Subtract 4/10 from 42/2, Solve 21 0/2

Subtract 4/10 from 42/2

1^st number: 21 0/2, 2^nd number: 4/10

42/2 - 4/10 is 103/5.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 10 is 10

Next, find the equivalent fraction of both fractional numbers with denominator 10
For the 1st fraction, since 2 × 5 = 10,
42/2 = 42 × 5/2 × 5 = 210/10
Likewise, for the 2nd fraction, since 10 × 1 = 10,
4/10 = 4 × 1/10 × 1 = 4/10
Subtract the two like fractions:
210/10 - 4/10 = 210 - 4/10 = 206/10
After reducing the fraction, the answer is 103/5
In mixed form: 203/5

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