Add 40/56 and 1/21
40/56 + 1/21 is 16/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
40/56 = 40 × 3/56 × 3 = 120/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
1/21 = 1 × 8/21 × 8 = 8/168 - Add the two like fractions:
120/168 + 8/168 = 120 + 8/168 = 128/168 - 128/168 simplified gives 16/21
- So, 40/56 + 1/21 = 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/56+1/21 40/56+2/21 40/56+1/42 40/56+3/21 40/56+1/63 40/56+5/21 40/56+7/21