Add 4/5 and 90/21
1st number: 4/5, 2nd number: 4 6/21
4/5 + 90/21 is 178/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
4/5 = 4 × 21/5 × 21 = 84/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
90/21 = 90 × 5/21 × 5 = 450/105 - Add the two like fractions:
84/105 + 450/105 = 84 + 450/105 = 534/105 - 534/105 simplified gives 178/35
- So, 4/5 + 90/21 = 178/35
In mixed form: 53/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/5+90/21 4/10+90/21 4/5+90/42 12/5+90/21 4/15+90/21 4/5+90/63 20/5+90/21 4/25+90/21 28/5+90/21 4/35+90/21