Add 20/28 and 45/80
20/28 + 45/80 is 143/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 28 × 20 = 560,
20/28 = 20 × 20/28 × 20 = 400/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
45/80 = 45 × 7/80 × 7 = 315/560 - Add the two like fractions:
400/560 + 315/560 = 400 + 315/560 = 715/560 - 715/560 simplified gives 143/112
- So, 20/28 + 45/80 = 143/112
In mixed form: 131/112
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