Add 21/70 and 21/16
1st number: 21/70, 2nd number: 1 5/16
21/70 + 21/16 is 129/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 16 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
21/70 = 21 × 8/70 × 8 = 168/560 - Likewise, for the 2nd fraction, since 16 × 35 = 560,
21/16 = 21 × 35/16 × 35 = 735/560 - Add the two like fractions:
168/560 + 735/560 = 168 + 735/560 = 903/560 - 903/560 simplified gives 129/80
- So, 21/70 + 21/16 = 129/80
In mixed form: 149/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+21/16 21/70+42/16 21/70+21/32 63/70+21/16 21/70+63/16 21/70+21/48 21/70+21/80