Add 32/21 and 70/80
1st number: 1 11/21, 2nd number: 70/80
32/21 + 70/80 is 403/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
32/21 = 32 × 80/21 × 80 = 2560/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
70/80 = 70 × 21/80 × 21 = 1470/1680 - Add the two like fractions:
2560/1680 + 1470/1680 = 2560 + 1470/1680 = 4030/1680 - 4030/1680 simplified gives 403/168
- So, 32/21 + 70/80 = 403/168
In mixed form: 267/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/21+70/80 32/42+70/80 96/21+70/80 32/63+70/80