Add 20/35 and 40/90
20/35 + 40/90 is 64/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 35 × 18 = 630,
20/35 = 20 × 18/35 × 18 = 360/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
40/90 = 40 × 7/90 × 7 = 280/630 - Add the two like fractions:
360/630 + 280/630 = 360 + 280/630 = 640/630 - 640/630 simplified gives 64/63
- So, 20/35 + 40/90 = 64/63
In mixed form: 11/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/35+40/90 20/35+80/90 20/70+40/90 60/35+40/90