Add 81/18 and 64/40
1st number: 4 9/18, 2nd number: 1 24/40
81/18 + 64/40 is 61/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
81/18 = 81 × 20/18 × 20 = 1620/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
64/40 = 64 × 9/40 × 9 = 576/360 - Add the two like fractions:
1620/360 + 576/360 = 1620 + 576/360 = 2196/360 - 2196/360 simplified gives 61/10
- So, 81/18 + 64/40 = 61/10
In mixed form: 61/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/36+64/40 81/18+64/80 81/54+64/40 81/90+64/40