Subtract 15/70 from 30/42
30/42 - 15/70 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 70 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 70 × 3 = 210,
15/70 = 15 × 3/70 × 3 = 45/210 - Subtract the two like fractions:
150/210 - 45/210 = 150 - 45/210 = 105/210 - After reducing the fraction, the answer is 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-15/70 30/42-30/70 30/84-15/70 90/42-15/70 30/42-45/70 30/42-75/70