Add 4/20 and 4/21
4/20 + 4/21 is 41/105.
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,
4/20 = 4 × 21/20 × 21 = 84/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
4/21 = 4 × 20/21 × 20 = 80/420 - Add the two like fractions:
84/420 + 80/420 = 84 + 80/420 = 164/420 - 164/420 simplified gives 41/105
- So, 4/20 + 4/21 = 41/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20+4/21 4/20+8/21 4/40+4/21 4/20+4/42 12/20+4/21 4/20+12/21 4/60+4/21 4/20+4/63 4/20+20/21 28/20+4/21 4/20+28/21