Square Roots

square root of a number is a value that, when multiplied by itself, gives the number. Example: 4 × 4 = 16, so a square root of 16 is 4. … The symbol is √ which always means the positive square root.

 

Square Root Symbol


The symbol “√” for the square root was first used in print in 1525, in Christoph Rudolff’s Coss. Sometimes called a “rand” or “radical symbol”

 

 

Calculating Square Root


  1. Use a calculator – use the square root button

OR

Guess and Check

  1. Start with a guess (let’s guess 4 is the square root of 10)
  2. divide by the guess (10/4 = 2.5)
  3. add that to the guess (4 + 2.5 = 6.5)
  4. then divide that result by 2, in other words halve it. (6.5/2 = 3.25)
  5. now, set that as the new guess, and start at 2) again

Perfect Squares


Sometimes called “squared numbers”

Video Tutorial


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