Add 20/40 and 25/90
20/40 + 25/90 is 7/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
20/40 = 20 × 9/40 × 9 = 180/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
25/90 = 25 × 4/90 × 4 = 100/360 - Add the two like fractions:
180/360 + 100/360 = 180 + 100/360 = 280/360 - 280/360 simplified gives 7/9
- So, 20/40 + 25/90 = 7/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+50/90 20/80+25/90 60/40+25/90 20/40+75/90