Rational numbers are any numbers that can be written as a fraction.
Examples of numbers that are rational are:
2/3 5/2 1/4 2 -8/2 0
Now, why are 2 and 0 examples of such numbers?
It is because 2 and 0 can be written as 2/1 and 0/1
We can also write rational numbers as a decimals.
We do this by performing a quick division that is dividing the numerator by the denominator
2/5 = 0.4 or
2/5 = 0.4000000 because you can continue division to keep getting zeros for the decimal places after 4
The bar on top of 0 means that if we continue to perform long division, we will keep getting an infinite number of zeros. Another way to convert 2/5 into a decimal is to notice that we can multiply 5 by 20 and 2 by 20 to get 40/100 and 40/100 = 0.40.
Diving by 100 or any other power of 10 is a straightforward process.
If you are dividing by 10, just move the decimal point one place to the left.
If you are dividing by 100, just move the decimal point 2 places to the left.
and so forth...
For 40/100, the decimal point is after 0 for 40.
Moving that two places to the left bring the decimal point right before the 4.
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