Subtract 12/42 from 25/15
1st number: 1 10/15, 2nd number: 12/42
25/15 - 12/42 is 29/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
25/15 = 25 × 14/15 × 14 = 350/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Subtract the two like fractions:
350/210 - 60/210 = 350 - 60/210 = 290/210 - After reducing the fraction, the answer is 29/21
- In mixed form: 18/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/15-12/42 25/15-24/42 25/30-12/42 25/15-12/84 75/15-12/42 25/15-36/42 25/45-12/42 25/15-60/42 25/75-12/42 25/15-84/42