Add 1/21 and 5/40
1/21 + 5/40 is 29/168.
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,
5/40 = 5 × 21/40 × 21 = 105/840 - Add the two like fractions:
40/840 + 105/840 = 40 + 105/840 = 145/840 - 145/840 simplified gives 29/168
- So, 1/21 + 5/40 = 29/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+5/40 1/21+10/40 1/42+5/40 1/21+5/80 3/21+5/40 1/21+15/40 1/63+5/40 5/21+5/40 1/21+25/40 7/21+5/40 1/21+35/40