Subtract 81/30 from 42/10
1st number: 4 2/10, 2nd number: 2 21/30
42/10 - 81/30 is 3/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 10 × 3 = 30,
42/10 = 42 × 3/10 × 3 = 126/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
81/30 = 81 × 1/30 × 1 = 81/30 - Subtract the two like fractions:
126/30 - 81/30 = 126 - 81/30 = 45/30 - After reducing the fraction, the answer is 3/2
- In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10-81/30 42/20-81/30 42/10-81/60 42/30-81/30 42/10-81/90 42/50-81/30 42/70-81/30