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This page provides a list of educational videos related to Square Numbers and Square Roots. You can also use this page to find sample questions, apps, worksheets, lessons , infographics and presentations related to Square Numbers and Square Roots.
Square Roots and Real Numbers
By Khan Academy
Khan Academy presents Square Roots and Real Numbers an educational video resource on math.
Square roots and real numbers
By MathPlanetVideos
Determine whether these numbers are rational or irrational
Approximating square roots
By Khan Academy
Learn how to find the approximate values of square roots. The examples used in this video are √32, √55, and √123. The technique used is to compare the squares of whole numbers to the number we're taking the square root of.
Imaginary Numbers | MathHelp.com
By MathHelp.com
This lesson covers estimating quotients. Students learn to estimate a product or quotient by first rounding each number to one non-zero digit. For example, to estimate 8,291 x 27, first round 8,291 down to 8,000, and round 27 up to 30, then multiply 8,000 x 30 to get 240,000.
Parallel Lines | MathHelp.com
By MathHelp.com
This lesson covers imaginary numbers. Students learn that the imaginary number "i" is equal to the square root of -1, which means that i^2 is equal to (the square root of -1) squared, which equals -1. Students also learn to simplify imaginary numbers. For example, to simplify the square root of -81, think of it as the square root of -1 times the square root of 81, which simplifies to i times 9, or 9i. To simplify 11/8i, the first step is to get rid of the "i" in the denominator by multiplying both the numerator and the denominator of the fraction by i, to get 11i/8i^2, and remember that i^2 = -1, so we have 11i/8(-1), or 11i/-8, or -11i/8.
Roots of decimals and fractions
By Khan Academy
Learn how to find the square root of a decimal number. The problem solved in this video is p^2 = 0.81.
Example: Complex roots for a quadratic | Algebra II | Khan Academy
By Khan Academy
This video shows us how to use the quadratic formula to find the roots of a quadratic equation when those roots are complex numbers. Apply the quadratic formula as you have before, but be very careful when simplifying the radical part of the formula. And, as always, double check that you calculated the number under the square root (called the discriminant) correctly! Most mistakes with the quadratic formula happen under the square root!
