Why decimals of rational numbers behave periodically?
46561
How can I prove that all rational numbers are either terminating decimal or repeating decimal numerals?
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
91744
Proving sum of sines is periodic when ratio of their frequencies is rational using differentation
121319
Why do I get a converging result when pressing cosine multiple times on a calculator?
134264
How to get exact Rationalize of a decimal number?
122226
Incorrect logic in popular proof of the irrationality of $\sqrt2$?
79160
Why do most formulas in physics have integer and rational exponents?
85422
What is the behavior of integer division?
130723
Why is the result of a raster calculation integer when it should be decimal?
7801
Can you raise a number to an irrational exponent?
120935
Why is every continuous function on the reals determined by its value on rationals?
149381
Relating the base-p periodic expansion of a rational to its p-adic representation
98294
Can decimal numbers be considered "even" or "odd"?
50905
Why rationalize the denominator?
30105
Multiples of an irrational number forming a dense subset
96846
Decimal representation begins with $N$
23164
Why are irrational numbers uncountable and rationals countable?