Add 81/63 and 70/40
1st number: 1 18/63, 2nd number: 1 30/40
81/63 + 70/40 is 85/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 40 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 63 × 40 = 2520,
81/63 = 81 × 40/63 × 40 = 3240/2520 - Likewise, for the 2nd fraction, since 40 × 63 = 2520,
70/40 = 70 × 63/40 × 63 = 4410/2520 - Add the two like fractions:
3240/2520 + 4410/2520 = 3240 + 4410/2520 = 7650/2520 - 7650/2520 simplified gives 85/28
- So, 81/63 + 70/40 = 85/28
In mixed form: 31/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/63+70/80