Add 42/50 and 84/21
1st number: 42/50, 2nd number: 4 0/21
42/50 + 84/21 is 121/25.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 21 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 50 × 21 = 1050,
42/50 = 42 × 21/50 × 21 = 882/1050 - Likewise, for the 2nd fraction, since 21 × 50 = 1050,
84/21 = 84 × 50/21 × 50 = 4200/1050 - Add the two like fractions:
882/1050 + 4200/1050 = 882 + 4200/1050 = 5082/1050 - 5082/1050 simplified gives 121/25
- So, 42/50 + 84/21 = 121/25
In mixed form: 421/25
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/50+84/21 42/50+84/42 42/50+84/63