Add 21/30 and 8/72
21/30 + 8/72 is 73/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 30 × 12 = 360,
21/30 = 21 × 12/30 × 12 = 252/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
8/72 = 8 × 5/72 × 5 = 40/360 - Add the two like fractions:
252/360 + 40/360 = 252 + 40/360 = 292/360 - 292/360 simplified gives 73/90
- So, 21/30 + 8/72 = 73/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+8/72 21/30+16/72 21/60+8/72 63/30+8/72 21/30+24/72 21/90+8/72 21/30+40/72 21/30+56/72