Subtract 1/84 from 42/40
1st number: 1 2/40, 2nd number: 1/84
42/40 - 1/84 is 109/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
42/40 = 42 × 21/40 × 21 = 882/840 - Likewise, for the 2nd fraction, since 84 × 10 = 840,
1/84 = 1 × 10/84 × 10 = 10/840 - Subtract the two like fractions:
882/840 - 10/840 = 882 - 10/840 = 872/840 - After reducing the fraction, the answer is 109/105
- In mixed form: 14/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40-1/84 42/40-2/84 42/80-1/84 42/40-3/84 42/40-5/84 42/40-7/84