Add 21/70 and 18/16
1st number: 21/70, 2nd number: 1 2/16
21/70 + 18/16 is 57/40.
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,
18/16 = 18 × 35/16 × 35 = 630/560 - Add the two like fractions:
168/560 + 630/560 = 168 + 630/560 = 798/560 - 798/560 simplified gives 57/40
- So, 21/70 + 18/16 = 57/40
In mixed form: 117/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+18/16 21/70+36/16 21/70+18/32 63/70+18/16 21/70+54/16 21/70+18/48 21/70+90/16 21/70+18/80