Subtract 2/40 from 3/84
3/84 - 2/40 is -1/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
3/84 = 3 × 10/84 × 10 = 30/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
2/40 = 2 × 21/40 × 21 = 42/840 - Subtract the two like fractions:
30/840 - 42/840 = 30 - 42/840 = -12/840 - After reducing the fraction, the answer is -1/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84-2/40 3/84-4/40 3/84-2/80 9/84-2/40 3/84-6/40 15/84-2/40 3/84-10/40 21/84-2/40 3/84-14/40