Add 28/90 and 8/40
28/90 + 8/40 is 23/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
28/90 = 28 × 4/90 × 4 = 112/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
8/40 = 8 × 9/40 × 9 = 72/360 - Add the two like fractions:
112/360 + 72/360 = 112 + 72/360 = 184/360 - 184/360 simplified gives 23/45
- So, 28/90 + 8/40 = 23/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90+8/40 28/90+16/40 28/90+8/80 84/90+8/40 28/90+24/40 28/90+56/40