Subtract 21/70 from 42/24
1st number: 1 18/24, 2nd number: 21/70
42/24 - 21/70 is 29/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 70 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 24 × 35 = 840,
42/24 = 42 × 35/24 × 35 = 1470/840 - Likewise, for the 2nd fraction, since 70 × 12 = 840,
21/70 = 21 × 12/70 × 12 = 252/840 - Subtract the two like fractions:
1470/840 - 252/840 = 1470 - 252/840 = 1218/840 - After reducing the fraction, the answer is 29/20
- In mixed form: 19/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/24-21/70 42/24-42/70 42/48-21/70 42/24-63/70 42/72-21/70