| Term | Definition |
| divide-and-average method | A method for approximating the square root of a number in which a number is divded to 2 more place than the number in the divisor. |
| divisor | The number by which the dividend is divided. |
| imaginary number | Number that involve the imaginary unit 1, defined as the square root of -1. |
| integer | A whole number or its opposite. |
| irrational number | Number that cannot be expressed in the form a/b where a and b are integers and b not equal to 0. |
| negative square | An imaginary number that shows the square root of a negative square number. |
| pi | The circumference of any circle divided by its diameter, approximately 3.14. |
| prime factorization | A way of expressing a whole number as a product of its prime factors. |
| principal square | the nonnegative square root of a number |