Add 81/21 and 70/64
1st number: 3 18/21, 2nd number: 1 6/64
81/21 + 70/64 is 1109/224.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 64 is 1344
Next, find the equivalent fraction of both fractional numbers with denominator 1344 - For the 1st fraction, since 21 × 64 = 1344,
81/21 = 81 × 64/21 × 64 = 5184/1344 - Likewise, for the 2nd fraction, since 64 × 21 = 1344,
70/64 = 70 × 21/64 × 21 = 1470/1344 - Add the two like fractions:
5184/1344 + 1470/1344 = 5184 + 1470/1344 = 6654/1344 - 6654/1344 simplified gives 1109/224
- So, 81/21 + 70/64 = 1109/224
In mixed form: 4213/224
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42+70/64 81/63+70/64