Add 21/75 and 4/90
21/75 + 4/90 is 73/225.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
21/75 = 21 × 6/75 × 6 = 126/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
4/90 = 4 × 5/90 × 5 = 20/450 - Add the two like fractions:
126/450 + 20/450 = 126 + 20/450 = 146/450 - 146/450 simplified gives 73/225
- So, 21/75 + 4/90 = 73/225
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/75+4/90 21/75+8/90 63/75+4/90 21/75+12/90 21/75+20/90 21/75+28/90