Add 72/80 and 4/42
72/80 + 4/42 is 209/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
72/80 = 72 × 21/80 × 21 = 1512/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
4/42 = 4 × 40/42 × 40 = 160/1680 - Add the two like fractions:
1512/1680 + 160/1680 = 1512 + 160/1680 = 1672/1680 - 1672/1680 simplified gives 209/210
- So, 72/80 + 4/42 = 209/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/80+8/42 72/80+4/84 72/80+12/42 72/80+20/42 72/80+28/42