Add 21/90 and 25/40
21/90 + 25/40 is 103/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
21/90 = 21 × 4/90 × 4 = 84/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
25/40 = 25 × 9/40 × 9 = 225/360 - Add the two like fractions:
84/360 + 225/360 = 84 + 225/360 = 309/360 - 309/360 simplified gives 103/120
- So, 21/90 + 25/40 = 103/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+25/40 21/90+50/40 21/90+25/80 63/90+25/40 21/90+75/40