Subtract 42/10 from 3/21
1st number: 3/21, 2nd number: 4 2/10
3/21 - 42/10 is -142/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
42/10 = 42 × 21/10 × 21 = 882/210 - Subtract the two like fractions:
30/210 - 882/210 = 30 - 882/210 = -852/210 - After reducing the fraction, the answer is -142/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-42/10 3/21-84/10 3/42-42/10 3/21-42/20 9/21-42/10 3/63-42/10 3/21-42/30 15/21-42/10 3/21-42/50 3/21-42/70