Add 90/2 and 72/21
1st number: 45 0/2, 2nd number: 3 9/21
90/2 + 72/21 is 339/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
90/2 = 90 × 21/2 × 21 = 1890/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
72/21 = 72 × 2/21 × 2 = 144/42 - Add the two like fractions:
1890/42 + 144/42 = 1890 + 144/42 = 2034/42 - 2034/42 simplified gives 339/7
- So, 90/2 + 72/21 = 339/7
In mixed form: 483/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/4+72/21 90/2+72/42 90/6+72/21 90/2+72/63 90/10+72/21 90/14+72/21