Add 81/70 and 15/40
1st number: 1 11/70, 2nd number: 15/40
81/70 + 15/40 is 429/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
81/70 = 81 × 4/70 × 4 = 324/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
15/40 = 15 × 7/40 × 7 = 105/280 - Add the two like fractions:
324/280 + 105/280 = 324 + 105/280 = 429/280 - So, 81/70 + 15/40 = 429/280
In mixed form: 1149/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/70+30/40 81/70+15/80 81/70+45/40 81/70+75/40