Question

is 8.4 an irrational number?

Answer 1

Irrational numbers are numbers which can NOT be written as `the ratio of integers`.

Example of a RATIONAL number:\[\Large\rm 7.2\]If we multiply this number by 10/10 it becomes,\[\Large\rm \frac{72}{10}\]

Answer 2

This is a ratio of integers, 72 and 10.
So 7.2 is a RATIONAL number.

Answer 3

Can we do something similar with 8.4 maybe? :o
Hmm, what'dyou think?