Add 21/7 and 5/90
1st number: 3 0/7, 2nd number: 5/90
21/7 + 5/90 is 55/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
21/7 = 21 × 90/7 × 90 = 1890/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
5/90 = 5 × 7/90 × 7 = 35/630 - Add the two like fractions:
1890/630 + 35/630 = 1890 + 35/630 = 1925/630 - 1925/630 simplified gives 55/18
- So, 21/7 + 5/90 = 55/18
In mixed form: 31/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+5/90 21/7+10/90 21/14+5/90 63/7+5/90 21/7+15/90 21/7+25/90 21/35+5/90 21/7+35/90 21/49+5/90