Subtract 1/40 from 27/30
27/30 - 1/40 is 7/8.
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,
27/30 = 27 × 4/30 × 4 = 108/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
1/40 = 1 × 3/40 × 3 = 3/120 - Subtract the two like fractions:
108/120 - 3/120 = 108 - 3/120 = 105/120 - After reducing the fraction, the answer is 7/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30-1/40 27/30-2/40 27/60-1/40 27/30-1/80 81/30-1/40 27/30-3/40 27/90-1/40 27/30-5/40 27/30-7/40