Add 16/40 and 21/81
16/40 + 21/81 is 89/135.
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,
16/40 = 16 × 81/40 × 81 = 1296/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
21/81 = 21 × 40/81 × 40 = 840/3240 - Add the two like fractions:
1296/3240 + 840/3240 = 1296 + 840/3240 = 2136/3240 - 2136/3240 simplified gives 89/135
- So, 16/40 + 21/81 = 89/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/40+21/81 16/40+42/81 16/80+21/81 48/40+21/81 16/40+63/81 80/40+21/81