Add 70/21 and 63/42
1st number: 3 7/21, 2nd number: 1 21/42
70/21 + 63/42 is 29/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
70/21 = 70 × 2/21 × 2 = 140/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
63/42 = 63 × 1/42 × 1 = 63/42 - Add the two like fractions:
140/42 + 63/42 = 140 + 63/42 = 203/42 - 203/42 simplified gives 29/6
- So, 70/21 + 63/42 = 29/6
In mixed form: 45/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/42+63/42 70/21+63/84 70/63+63/42