Add 1/90 and 45/21
1st number: 1/90, 2nd number: 2 3/21
1/90 + 45/21 is 1357/630.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
1/90 = 1 × 7/90 × 7 = 7/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
45/21 = 45 × 30/21 × 30 = 1350/630 - Add the two like fractions:
7/630 + 1350/630 = 7 + 1350/630 = 1357/630 - So, 1/90 + 45/21 = 1357/630
In mixed form: 297/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90+45/21 1/90+90/21 1/90+45/42 3/90+45/21 1/90+45/63 5/90+45/21 7/90+45/21