Subtract 18/40 from 42/4, Solve 10 2/4

Subtract 18/40 from 42/4

1^st number: 10 2/4, 2^nd number: 18/40

42/4 - 18/40 is 201/20.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 40 is 40

Next, find the equivalent fraction of both fractional numbers with denominator 40
For the 1st fraction, since 4 × 10 = 40,
42/4 = 42 × 10/4 × 10 = 420/40
Likewise, for the 2nd fraction, since 40 × 1 = 40,
18/40 = 18 × 1/40 × 1 = 18/40
Subtract the two like fractions:
420/40 - 18/40 = 420 - 18/40 = 402/40
After reducing the fraction, the answer is 201/20
In mixed form: 101/20

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad