Subtract 15/80 from 40/30
1st number: 1 10/30, 2nd number: 15/80
40/30 - 15/80 is 55/48.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 30 × 8 = 240,
40/30 = 40 × 8/30 × 8 = 320/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
15/80 = 15 × 3/80 × 3 = 45/240 - Subtract the two like fractions:
320/240 - 45/240 = 320 - 45/240 = 275/240 - After reducing the fraction, the answer is 55/48
- In mixed form: 17/48
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-15/80 40/30-30/80 40/60-15/80 40/30-45/80 40/90-15/80 40/30-75/80