2, and any other Prime number (not 2).
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135100 and 35000, which, if added together, makes 170100.
Rounding is closer because the amount added to one number is the same as the amount subtracted from the other number which makes the answer match exactly.
Start with the natural numbers, 0, 1, 2, ... .Then add the set of negative numbers: this makes up the integers. Next add in the set of ratios of any two integers (the second being non-zero): this makes up the rational numbers. Next add in the set of all numbers which cannot be expressed as terminating or repeating decimal numbers. This is the set of irrational numbers. The rationals and irrationals, together, make up the set of real numbers.
24 and 35 have factors other than 1 and the number itself. That makes them composite numbers.
The prime factors of 168 are 23 x 3 x 7.