Add 40/4 and 8/21
1st number: 10 0/4, 2nd number: 8/21
40/4 + 8/21 is 218/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
40/4 = 40 × 21/4 × 21 = 840/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
8/21 = 8 × 4/21 × 4 = 32/84 - Add the two like fractions:
840/84 + 32/84 = 840 + 32/84 = 872/84 - 872/84 simplified gives 218/21
- So, 40/4 + 8/21 = 218/21
In mixed form: 108/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/4+8/21 40/4+16/21 40/8+8/21 40/4+8/42 40/4+24/21 40/12+8/21 40/4+8/63 40/4+40/21 40/20+8/21 40/4+56/21 40/28+8/21