The number 42 has two square roots: 6.48 and -6.48, each accurate to two decimal places. The positive root, 6.48, is called the principal square root. More »

A square root is the result of "unsquaring" a number, or the reversal of the process of squaring. The root is, as its name implies, a squared number reduced to its most basic form. More » Math Algebra

The square root of 1,600 is 40. The square root of any number can be determined by plugging it into the equation x times x equals y. Thus, for 1,600, the formula is 40 times 40 equals 1,600. More »

Two fun facts about the number two are that it is the only even prime number and its root is an irrational number. All numbers that can only be divided by themselves and by 1 are classified as prime. More »

A complex number in standard form is a number that can be written as a + bi where a is the real number, b is the imaginary part and i is the imaginary unit that represents the square root of -1. More »

The magnitude, or modulus, of a complex number in the form z = a + bi is the positive square root of the sum of the squares of a and b. In other words, |z| = sqrt(a^2 + b^2). More »

Rounding to two decimal places means leaving only two numbers to the right of the decimal point. When the number in the third decimal place is any number between zero and four, round to two decimal places by deleting eve... More » Math Numbers