Add 42/21 and 30/25
1st number: 2 0/21, 2nd number: 1 5/25
42/21 + 30/25 is 16/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
42/21 = 42 × 25/21 × 25 = 1050/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
30/25 = 30 × 21/25 × 21 = 630/525 - Add the two like fractions:
1050/525 + 630/525 = 1050 + 630/525 = 1680/525 - 1680/525 simplified gives 16/5
- So, 42/21 + 30/25 = 16/5
In mixed form: 31/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+30/25 42/21+60/25 42/21+30/50 42/21+90/25 42/63+30/25 42/21+30/75