Add 20/40 and 90/9
1st number: 20/40, 2nd number: 10 0/9
20/40 + 90/9 is 21/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 9 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 9 × 40 = 360,
90/9 = 90 × 40/9 × 40 = 3600/360 - Add the two like fractions:
180/360 + 3600/360 = 180 + 3600/360 = 3780/360 - 3780/360 simplified gives 21/2
- So, 20/40 + 90/9 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/80+90/9 20/40+90/18 60/40+90/9 20/40+90/27 20/40+90/45 20/40+90/63