Add 4/21 and 45/90
4/21 + 45/90 is 29/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
4/21 = 4 × 30/21 × 30 = 120/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
45/90 = 45 × 7/90 × 7 = 315/630 - Add the two like fractions:
120/630 + 315/630 = 120 + 315/630 = 435/630 - 435/630 simplified gives 29/42
- So, 4/21 + 45/90 = 29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+45/90 4/42+45/90 12/21+45/90 4/63+45/90 20/21+45/90 28/21+45/90