Add 18/36 and 8/21
18/36 + 8/21 is 37/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
8/21 = 8 × 12/21 × 12 = 96/252 - Add the two like fractions:
126/252 + 96/252 = 126 + 96/252 = 222/252 - 222/252 simplified gives 37/42
- So, 18/36 + 8/21 = 37/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/36+16/21 18/72+8/21 18/36+8/42 54/36+8/21 18/36+24/21 18/36+8/63 90/36+8/21 18/36+40/21 18/36+56/21