Subtract 27/80 from 42/30
1st number: 1 12/30, 2nd number: 27/80
42/30 - 27/80 is 17/16.
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,
42/30 = 42 × 8/30 × 8 = 336/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
27/80 = 27 × 3/80 × 3 = 81/240 - Subtract the two like fractions:
336/240 - 81/240 = 336 - 81/240 = 255/240 - After reducing the fraction, the answer is 17/16
- In mixed form: 11/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-27/80 42/30-54/80 42/60-27/80 42/30-81/80 42/90-27/80