Subtract 1/42 from 30/10, Solve 3 0/10

Subtract 1/42 from 30/10

1^st number: 3 0/10, 2^nd number: 1/42

30/10 - 1/42 is 125/42.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 42 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 10 × 21 = 210,
30/10 = 30 × 21/10 × 21 = 630/210
Likewise, for the 2nd fraction, since 42 × 5 = 210,
1/42 = 1 × 5/42 × 5 = 5/210
Subtract the two like fractions:
630/210 - 5/210 = 630 - 5/210 = 625/210
After reducing the fraction, the answer is 125/42
In mixed form: 241/42

MathStep (Works offline)

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