Add 4/20 and 18/81
4/20 + 18/81 is 19/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
4/20 = 4 × 81/20 × 81 = 324/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
18/81 = 18 × 20/81 × 20 = 360/1620 - Add the two like fractions:
324/1620 + 360/1620 = 324 + 360/1620 = 684/1620 - 684/1620 simplified gives 19/45
- So, 4/20 + 18/81 = 19/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20+18/81 4/20+36/81 4/40+18/81 12/20+18/81 4/20+54/81 4/60+18/81 4/20+90/81 28/20+18/81