Add 21/70 and 49/63
21/70 + 49/63 is 97/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
21/70 = 21 × 9/70 × 9 = 189/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
49/63 = 49 × 10/63 × 10 = 490/630 - Add the two like fractions:
189/630 + 490/630 = 189 + 490/630 = 679/630 - 679/630 simplified gives 97/90
- So, 21/70 + 49/63 = 97/90
In mixed form: 17/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70+49/63 21/70+98/63 63/70+49/63