Subtract 8/40 from 3/30
3/30 - 8/40 is -1/10.
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,
3/30 = 3 × 4/30 × 4 = 12/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
8/40 = 8 × 3/40 × 3 = 24/120 - Subtract the two like fractions:
12/120 - 24/120 = 12 - 24/120 = -12/120 - After reducing the fraction, the answer is -1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/30-8/40 3/30-16/40 3/60-8/40 3/30-8/80 9/30-8/40 3/30-24/40 3/90-8/40 15/30-8/40 21/30-8/40 3/30-56/40