Subtract 80/40 from 40/30
1st number: 1 10/30, 2nd number: 2 0/40
40/30 - 80/40 is -2/3.
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,
40/30 = 40 × 4/30 × 4 = 160/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
80/40 = 80 × 3/40 × 3 = 240/120 - Subtract the two like fractions:
160/120 - 240/120 = 160 - 240/120 = -80/120 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-80/40 40/60-80/40 40/90-80/40