The square root of 61 is 7.81. A squared number means that number is multiplied by itself. The square root is the opposite. It indicates the number, when multiplied by itself, equals the first number.
Square roots are represented by a special symbol called a radical. This symbol looks like a check mark. A square root equation is written like this: ?16=4.
Squares of whole numbers are called perfect squares. For example: ?1=1, ?4=2 and ?9=3.
Square roots are useful when you need to calculate area. A real-life example is calculating how much carpet is needed for a room. If the room is 100 square feet (?100=10), you buy a piece of carpet that is 10 feet wide and 10 feet long.