Subtract 30/40 from 81/6
1st number: 13 3/6, 2nd number: 30/40
81/6 - 30/40 is 51/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 6 × 20 = 120,
81/6 = 81 × 20/6 × 20 = 1620/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
30/40 = 30 × 3/40 × 3 = 90/120 - Subtract the two like fractions:
1620/120 - 90/120 = 1620 - 90/120 = 1530/120 - After reducing the fraction, the answer is 51/4
- In mixed form: 123/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/6-60/40 81/12-30/40 81/6-30/80 81/6-90/40 81/18-30/40 81/30-30/40 81/42-30/40