Add 63/70 and 7/21
63/70 + 7/21 is 37/30.
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,
7/21 = 7 × 10/21 × 10 = 70/210 - Add the two like fractions:
189/210 + 70/210 = 189 + 70/210 = 259/210 - 259/210 simplified gives 37/30
- So, 63/70 + 7/21 = 37/30
In mixed form: 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/70+14/21 63/70+7/42 63/70+7/63 63/70+35/21 63/70+49/21