Add 42/84 and 45/25
1st number: 42/84, 2nd number: 1 20/25
42/84 + 45/25 is 23/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 25 is 2100
Next, find the equivalent fraction of both fractional numbers with denominator 2100 - For the 1st fraction, since 84 × 25 = 2100,
42/84 = 42 × 25/84 × 25 = 1050/2100 - Likewise, for the 2nd fraction, since 25 × 84 = 2100,
45/25 = 45 × 84/25 × 84 = 3780/2100 - Add the two like fractions:
1050/2100 + 3780/2100 = 1050 + 3780/2100 = 4830/2100 - 4830/2100 simplified gives 23/10
- So, 42/84 + 45/25 = 23/10
In mixed form: 23/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+90/25 42/84+45/50 42/84+45/75