Subtract 16/42 from 7/30
7/30 - 16/42 is -31/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
7/30 = 7 × 7/30 × 7 = 49/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
16/42 = 16 × 5/42 × 5 = 80/210 - Subtract the two like fractions:
49/210 - 80/210 = 49 - 80/210 = -31/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30-16/42 7/30-32/42 7/60-16/42 7/30-16/84 21/30-16/42 7/30-48/42 7/90-16/42 35/30-16/42 7/30-80/42 49/30-16/42