Add 42/40 and 4/81
1st number: 1 2/40, 2nd number: 4/81
42/40 + 4/81 is 1781/1620.
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,
42/40 = 42 × 81/40 × 81 = 3402/3240 - Likewise, for the 2nd fraction, since 81 × 40 = 3240,
4/81 = 4 × 40/81 × 40 = 160/3240 - Add the two like fractions:
3402/3240 + 160/3240 = 3402 + 160/3240 = 3562/3240 - 3562/3240 simplified gives 1781/1620
- So, 42/40 + 4/81 = 1781/1620
In mixed form: 1161/1620
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40+4/81 42/40+8/81 42/80+4/81 42/40+12/81 42/40+20/81 42/40+28/81