Add 20/90 and 64/63
1st number: 20/90, 2nd number: 1 1/63
20/90 + 64/63 is 26/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 63 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
20/90 = 20 × 7/90 × 7 = 140/630 - Likewise, for the 2nd fraction, since 63 × 10 = 630,
64/63 = 64 × 10/63 × 10 = 640/630 - Add the two like fractions:
140/630 + 640/630 = 140 + 640/630 = 780/630 - 780/630 simplified gives 26/21
- So, 20/90 + 64/63 = 26/21
In mixed form: 15/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+64/63 60/90+64/63