Subtract 72/42 from 1/30
1st number: 1/30, 2nd number: 1 30/42
1/30 - 72/42 is -353/210.
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,
1/30 = 1 × 7/30 × 7 = 7/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
72/42 = 72 × 5/42 × 5 = 360/210 - Subtract the two like fractions:
7/210 - 360/210 = 7 - 360/210 = -353/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/30-72/42 1/60-72/42 1/30-72/84 3/30-72/42 1/90-72/42 5/30-72/42 7/30-72/42