Add 63/70 and 84/21
1st number: 63/70, 2nd number: 4 0/21
63/70 + 84/21 is 49/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
63/70 = 63 × 3/70 × 3 = 189/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
84/21 = 84 × 10/21 × 10 = 840/210 - Add the two like fractions:
189/210 + 840/210 = 189 + 840/210 = 1029/210 - 1029/210 simplified gives 49/10
- So, 63/70 + 84/21 = 49/10
In mixed form: 49/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/70+84/42 63/70+84/63