Add 4/21 and 70/80
4/21 + 70/80 is 179/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 21 × 80 = 1680,
4/21 = 4 × 80/21 × 80 = 320/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
70/80 = 70 × 21/80 × 21 = 1470/1680 - Add the two like fractions:
320/1680 + 1470/1680 = 320 + 1470/1680 = 1790/1680 - 1790/1680 simplified gives 179/168
- So, 4/21 + 70/80 = 179/168
In mixed form: 111/168
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