Subtract 1/10 from 42/21
1st number: 2 0/21, 2nd number: 1/10
42/21 - 1/10 is 19/10.
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,
42/21 = 42 × 10/21 × 10 = 420/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
1/10 = 1 × 21/10 × 21 = 21/210 - Subtract the two like fractions:
420/210 - 21/210 = 420 - 21/210 = 399/210 - After reducing the fraction, the answer is 19/10
- In mixed form: 19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-1/10 42/21-2/10 42/21-1/20 42/21-3/10 42/63-1/10 42/21-1/30 42/21-5/10 42/21-1/50 42/21-7/10 42/21-1/70