Add 42/21 and 45/60
1st number: 2 0/21, 2nd number: 45/60
42/21 + 45/60 is 11/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
42/21 = 42 × 20/21 × 20 = 840/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
45/60 = 45 × 7/60 × 7 = 315/420 - Add the two like fractions:
840/420 + 315/420 = 840 + 315/420 = 1155/420 - 1155/420 simplified gives 11/4
- So, 42/21 + 45/60 = 11/4
In mixed form: 23/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+45/60 42/21+90/60 42/63+45/60