Add 21/72 and 90/40
1st number: 21/72, 2nd number: 2 10/40
21/72 + 90/40 is 61/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
90/40 = 90 × 9/40 × 9 = 810/360 - Add the two like fractions:
105/360 + 810/360 = 105 + 810/360 = 915/360 - 915/360 simplified gives 61/24
- So, 21/72 + 90/40 = 61/24
In mixed form: 213/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+90/40 21/72+90/80 63/72+90/40