Add 2/40 and 20/21
2/40 + 20/21 is 421/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
2/40 = 2 × 21/40 × 21 = 42/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
20/21 = 20 × 40/21 × 40 = 800/840 - Add the two like fractions:
42/840 + 800/840 = 42 + 800/840 = 842/840 - 842/840 simplified gives 421/420
- So, 2/40 + 20/21 = 421/420
In mixed form: 11/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/40+20/21 2/40+40/21 2/80+20/21 2/40+20/42 6/40+20/21 2/40+60/21 2/40+20/63 10/40+20/21 14/40+20/21