Add 8/20 and 70/81
8/20 + 70/81 is 512/405.
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,
8/20 = 8 × 81/20 × 81 = 648/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
70/81 = 70 × 20/81 × 20 = 1400/1620 - Add the two like fractions:
648/1620 + 1400/1620 = 648 + 1400/1620 = 2048/1620 - 2048/1620 simplified gives 512/405
- So, 8/20 + 70/81 = 512/405
In mixed form: 1107/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20+70/81 8/40+70/81 24/20+70/81 8/60+70/81 40/20+70/81 56/20+70/81