Add 70/21 and 1/28
1st number: 3 7/21, 2nd number: 1/28
70/21 + 1/28 is 283/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
1/28 = 1 × 3/28 × 3 = 3/84 - Add the two like fractions:
280/84 + 3/84 = 280 + 3/84 = 283/84 - So, 70/21 + 1/28 = 283/84
In mixed form: 331/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+2/28 70/42+1/28 70/21+1/56 70/21+3/28 70/63+1/28 70/21+1/84 70/21+5/28 70/21+7/28