Add 90/21 and 24/40
1st number: 4 6/21, 2nd number: 24/40
90/21 + 24/40 is 171/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
90/21 = 90 × 40/21 × 40 = 3600/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
24/40 = 24 × 21/40 × 21 = 504/840 - Add the two like fractions:
3600/840 + 504/840 = 3600 + 504/840 = 4104/840 - 4104/840 simplified gives 171/35
- So, 90/21 + 24/40 = 171/35
In mixed form: 431/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+48/40 90/42+24/40 90/21+24/80 90/21+72/40 90/63+24/40