Add 40/20 and 5/21
1st number: 2 0/20, 2nd number: 5/21
40/20 + 5/21 is 47/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
40/20 = 40 × 21/20 × 21 = 840/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
5/21 = 5 × 20/21 × 20 = 100/420 - Add the two like fractions:
840/420 + 100/420 = 840 + 100/420 = 940/420 - 940/420 simplified gives 47/21
- So, 40/20 + 5/21 = 47/21
In mixed form: 25/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/20+5/21 40/20+10/21 40/20+5/42 40/20+15/21 40/60+5/21 40/20+5/63 40/20+25/21 40/20+35/21