Add 20/90 and 45/70
20/90 + 45/70 is 109/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 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 70 × 9 = 630,
45/70 = 45 × 9/70 × 9 = 405/630 - Add the two like fractions:
140/630 + 405/630 = 140 + 405/630 = 545/630 - 545/630 simplified gives 109/126
- So, 20/90 + 45/70 = 109/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+45/70 20/90+90/70 60/90+45/70