8th Grade · Expressions & Equations
Square Root
8.EE.A.2 · 8.G.B.7
Definition
A value that, multiplied by itself, gives the original number. It is the inverse of squaring and equals the side length of a square with that area.
Examples
- √49 = 7, since 7×7=49.
- The square root of a perfect square is a whole number; other square roots are irrational.
Key rule
Square root undoes squaring.
Memory hook
What number times itself gives this?