Subtract 12/40 from 75/21
1st number: 3 12/21, 2nd number: 12/40
75/21 - 12/40 is 229/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
75/21 = 75 × 40/21 × 40 = 3000/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
12/40 = 12 × 21/40 × 21 = 252/840 - Subtract the two like fractions:
3000/840 - 252/840 = 3000 - 252/840 = 2748/840 - After reducing the fraction, the answer is 229/70
- In mixed form: 319/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/21-24/40 75/42-12/40 75/21-12/80 75/21-36/40 75/63-12/40 75/21-60/40 75/21-84/40