Subtract 72/18 from 3/30
1st number: 3/30, 2nd number: 4 0/18
3/30 - 72/18 is -39/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
3/30 = 3 × 3/30 × 3 = 9/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
72/18 = 72 × 5/18 × 5 = 360/90 - Subtract the two like fractions:
9/90 - 360/90 = 9 - 360/90 = -351/90 - After reducing the fraction, the answer is -39/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30-72/18 3/60-72/18 3/30-72/36 9/30-72/18 3/90-72/18 3/30-72/54 15/30-72/18 3/30-72/90 21/30-72/18