Subtract 42/21 from 1/10
1st number: 1/10, 2nd number: 2 0/21
1/10 - 42/21 is -19/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
1/10 = 1 × 21/10 × 21 = 21/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Subtract the two like fractions:
21/210 - 420/210 = 21 - 420/210 = -399/210 - After reducing the fraction, the answer is -19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/10-42/21 1/10-84/21 1/20-42/21 3/10-42/21 1/30-42/21 1/10-42/63 5/10-42/21 1/50-42/21 7/10-42/21 1/70-42/21