Subtract 42/10 from 54/21
1st number: 2 12/21, 2nd number: 4 2/10
54/21 - 42/10 is -57/35.
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,
54/21 = 54 × 10/21 × 10 = 540/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
42/10 = 42 × 21/10 × 21 = 882/210 - Subtract the two like fractions:
540/210 - 882/210 = 540 - 882/210 = -342/210 - After reducing the fraction, the answer is -57/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-84/10 54/42-42/10 54/21-42/20 54/63-42/10 54/21-42/30 54/21-42/50 54/21-42/70