Square roots (8th grade math/algebra 1)

When we square a number, we multiply it by itself. For example, 6 squared is 36. Square root is the opposite of that — so, the square root of 36 is 6. Actually, to be more exact, there are two answers to the "square root of 36" — both 6 and −6, but the PRINCIPAL square root of 36 is 6.

I show you a simple visual to help you remember how square roots tie in with the area and side length of squares.

Then we find the two consecutive whole numbers between which the square root of 38 lies.

Lastly, we look at the square roots of some decimals and fractions, and learn that the radical sign acts as a grouping symbol.

See also

Irrational numbers — video lesson

Math Mammoth Grade 8 curriculum

Back to the list of 8th grade videos

Back to the index of all videos