Subtract 27/40 from 12/30
12/30 - 27/40 is -11/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
12/30 = 12 × 4/30 × 4 = 48/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
27/40 = 27 × 3/40 × 3 = 81/120 - Subtract the two like fractions:
48/120 - 81/120 = 48 - 81/120 = -33/120 - After reducing the fraction, the answer is -11/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/30-27/40 12/30-54/40 12/60-27/40 12/30-27/80 36/30-27/40 12/30-81/40 12/90-27/40 60/30-27/40 84/30-27/40