Add 1/21 and 80/40
1st number: 1/21, 2nd number: 2 0/40
1/21 + 80/40 is 43/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
1/21 = 1 × 40/21 × 40 = 40/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
80/40 = 80 × 21/40 × 21 = 1680/840 - Add the two like fractions:
40/840 + 1680/840 = 40 + 1680/840 = 1720/840 - 1720/840 simplified gives 43/21
- So, 1/21 + 80/40 = 43/21
In mixed form: 21/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+80/40 1/42+80/40 3/21+80/40 1/63+80/40 5/21+80/40 7/21+80/40