Subtract 2/10 from 30/42
30/42 - 2/10 is 18/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
30/42 = 30 × 5/42 × 5 = 150/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
2/10 = 2 × 21/10 × 21 = 42/210 - Subtract the two like fractions:
150/210 - 42/210 = 150 - 42/210 = 108/210 - After reducing the fraction, the answer is 18/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-2/10 30/42-4/10 30/84-2/10 30/42-2/20 90/42-2/10 30/42-6/10 30/42-2/30 30/42-2/50 30/42-14/10 30/42-2/70