Add 15/40 and 49/81
15/40 + 49/81 is 635/648.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 81 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 40 × 81 = 3240,
15/40 = 15 × 81/40 × 81 = 1215/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
49/81 = 49 × 40/81 × 40 = 1960/3240 - Add the two like fractions:
1215/3240 + 1960/3240 = 1215 + 1960/3240 = 3175/3240 - 3175/3240 simplified gives 635/648
- So, 15/40 + 49/81 = 635/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+49/81 15/40+98/81 15/80+49/81 45/40+49/81 75/40+49/81