Add 81/25 and 21/90
1st number: 3 6/25, 2nd number: 21/90
81/25 + 21/90 is 521/150.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 25 × 18 = 450,
81/25 = 81 × 18/25 × 18 = 1458/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
21/90 = 21 × 5/90 × 5 = 105/450 - Add the two like fractions:
1458/450 + 105/450 = 1458 + 105/450 = 1563/450 - 1563/450 simplified gives 521/150
- So, 81/25 + 21/90 = 521/150
In mixed form: 371/150
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/25+42/90 81/50+21/90 81/25+63/90 81/75+21/90