Add 36/90 and 90/21
1st number: 36/90, 2nd number: 4 6/21
36/90 + 90/21 is 164/35.
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,
36/90 = 36 × 7/90 × 7 = 252/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
90/21 = 90 × 30/21 × 30 = 2700/630 - Add the two like fractions:
252/630 + 2700/630 = 252 + 2700/630 = 2952/630 - 2952/630 simplified gives 164/35
- So, 36/90 + 90/21 = 164/35
In mixed form: 424/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+90/21 36/90+90/42 36/90+90/63