Fractions have numerators and denominators. 81 isn't a fraction.
You could write it as "81/1" if you want to. Then the numerator is 81, and
the denominator is 1.
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They are called denominators and numerators!
No. Convert them to like denominators and add the numerators.
If the denominators are the same, subtract the numerators. If the denominators are different, convert them to equivalent fractions with a common denominator and subtract the numerators.
numerators and denominators are both part of a fraction. the numerator is on top and the denominator is on the bottom. for example, in 2/3, 2 is the numerator and 3 is the denominator
Yes, 'fractions' with different numerators can be added, but not with different denominators. In the case where you have different denominators, you must find the LCM (lowest common multiple).