Subtract 1/80 from 40/30
1st number: 1 10/30, 2nd number: 1/80
40/30 - 1/80 is 317/240.
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,
1/80 = 1 × 3/80 × 3 = 3/240 - Subtract the two like fractions:
320/240 - 3/240 = 320 - 3/240 = 317/240 - In mixed form: 177/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-1/80 40/30-2/80 40/60-1/80 40/30-3/80 40/90-1/80 40/30-5/80 40/30-7/80