Add 21/70 and 9/28
21/70 + 9/28 is 87/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
21/70 = 21 × 2/70 × 2 = 42/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
9/28 = 9 × 5/28 × 5 = 45/140 - Add the two like fractions:
42/140 + 45/140 = 42 + 45/140 = 87/140 - So, 21/70 + 9/28 = 87/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+9/28 21/70+18/28 21/70+9/56 63/70+9/28 21/70+27/28 21/70+9/84 21/70+45/28 21/70+63/28