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In this example, we're asked to find the square root
each of the following numbers, and rounded to two decimal places if needed.
Indicate those that are perfect squares and explain
why. So I brought the calculator image up so that you can see
on your calculator, you will often have this square root
key which will look like what I'm pointing to here on the screen.
To access that on my calculator I need to click the 2nd function key
and then I'm going to type in
169 and I'm going to hit
Enter. That's going to give me my value. So the square root of 169
is 13 and that means
that the square-root of 169,
and I should make that little piece there are more obvious,
The square root of 169 is a perfect square
and the reason for that is that its
square root is a whole number.
So square root of 169 is a perfect square because
square root of 169
is a whole number. So that's how we determine
if we have a perfect square. So let's clear
this and see what we have for the square root
of 31. And then I
press enter and if I want to round that,
I would round that to two decimal places
5.57. So
square root of 31 is not a perfect square,
and let's see about square root of 9. We could probably figure that one out in our head
but let's use our calculator anyway.
Square root of 9 equals 3.
And the square root of 9 then is a perfect square.
And the reason is because
square root of 9 is a whole number