Add 81/40 and 70/15
1st number: 2 1/40, 2nd number: 4 10/15
81/40 + 70/15 is 803/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
81/40 = 81 × 3/40 × 3 = 243/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
70/15 = 70 × 8/15 × 8 = 560/120 - Add the two like fractions:
243/120 + 560/120 = 243 + 560/120 = 803/120 - So, 81/40 + 70/15 = 803/120
In mixed form: 683/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/80+70/15 81/40+70/30 81/40+70/45 81/40+70/75