Add 42/21 and 2/80
1st number: 2 0/21, 2nd number: 2/80
42/21 + 2/80 is 81/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
42/21 = 42 × 80/21 × 80 = 3360/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
2/80 = 2 × 21/80 × 21 = 42/1680 - Add the two like fractions:
3360/1680 + 42/1680 = 3360 + 42/1680 = 3402/1680 - 3402/1680 simplified gives 81/40
- So, 42/21 + 2/80 = 81/40
In mixed form: 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+2/80 42/21+4/80 42/21+6/80 42/63+2/80 42/21+10/80 42/21+14/80