Subtract 1/10 from 42/80
42/80 - 1/10 is 17/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 10 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Likewise, for the 2nd fraction, since 10 × 8 = 80,
1/10 = 1 × 8/10 × 8 = 8/80 - Subtract the two like fractions:
42/80 - 8/80 = 42 - 8/80 = 34/80 - After reducing the fraction, the answer is 17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80-1/10 42/80-2/10 42/80-1/20 42/80-3/10 42/80-1/30 42/80-5/10 42/80-1/50 42/80-7/10 42/80-1/70