Khan Academy
Example 1: Multiplying a Binomial by a Binomial, Algebra I
There are particular ways to multiply binomials. One could use the FOIL method or employ the distributive property. Sal walks through each step of the FOIL method and then shows that using distribution results in the same answer. This is...
Khan Academy
Identity Property of 1, Arithmetic Properties, Pre-Algebra
Part of building solid number sense is understanding the laws and properties of multiplication and addition. Elementary school students can watch Sal multiply using the number one. He explains that multiplying any number by one equals...
Khan Academy
Rounding Whole Numbers 2, Arithmetic Properties, Pre-Algebra
This is the second in a series of three Khan Academy videos on rounding whole numbers. Students watch Sal Khan round the number 423,275 to the nearest thousand by looking at the number in the hundreds place. If it is five or higher, you...
Khan Academy
Finding a Number's Place Value, Arithmetic Properties, Pre-Algebra
Khan Academy helps learners grasp the concept of Place Value. Students will break down the number 4356 as four thousands plus three hundreds plus five tens plus six ones, and then label the number by place value. This video would be most...
Khan Academy
Mixed Numbers: Changing from an Improper Fraction, Fractions, Pre-Algebra
This video on changing improper fractions to mixed numbers would nicely complement the Khan Academy video on writing mixed numbers as improper fractions. Sal first shows students how to convert improper fractions. Then, he uses drawings...
Khan Academy
Understanding Square Roots, Pre-Algebra
What is the square root of 100? Sal explains what the square root of 100 is, but he needs a little help explaining why. Note: This concept can be challenging for some. If you are showing this video to your class, it does not stand alone....
Khan Academy
Comparing Fractions, Fractions, Pre-Algebra
In this video, Sal determines if 30/45 and 54/81 are equivalent fractions. He explains that he looks at each numerator and denominator as two numbers multiplied together. Then he simplifies both fractions to conclude that 30/45 and 54/81...
Khan Academy
Proportion Word Problem (Example 1)
This video elaborates on the basic concept of finding an unknown by analyzing a word problem and then applying one of the techniques seen in the previous video. Tip: Use this word problem as a warm-up before your math lesson.
Khan Academy
Multiplication Estimation Example, Multiplication and Division, Arithmetic
Are your students learning about solving word problems involving multiplication? If they are, then this video could be a perfect complement to your lesson. Sal shows students how to use rounding to estimate the product of a double-digit...
Khan Academy
Comparing Celsius and Fahrenheit Temperature Scales, Pre-Algebra
What exactly is the difference between Celsius and Fahrenheit? Watch this video to find out. Sal identifies and defines the Celsius and Fahrenheit scales, assesses the differences, and then labels boiling and freezing on each of the...
Khan Academy
Dividing Fractions
Here is an example problem that requires Sal to divide by the reciprocal. He demonstrates dividing the fraction and rewriting it as a mixed number. Sal nicely explains why multiplying a fraction is the same as dividing it by its reciprocal.
Khan Academy
Dividing a Decimal by a Power of 10: Shortcut, Decimals, Pre-Algebra
Occasionally, in mathematics, there are "shortcuts" one can take. Sal explains a quick way to divide decimal numbers. He demonstrates that in some instances, simply shifting the decimal point to the left will result in a correct answer.
Khan Academy
Example 3: Multiplying a Monomial by a Polynomial, Algebra I
Can you multiply a monomial by a polynomial? Yes, you can, if you use the distributive property. Sal describes how to distribute the monomial term over the entire polynomial expression. He does an excellent job explaining this concept.
Khan Academy
Dividing Polynomials 1, Polynomial and Rational Functions, Algebra II
Divide two polynomial expressions by writing the problem as a fraction or as long division. Sal shows how to use long division to divide polynomials. A solid understanding of polynomial operations is necessary to grasp this video.
Khan Academy
Rounding Whole Numbers 3, Arithmetic Properties, Pre-Algebra
Sal Khan completes the three-part rounding series with this Khan Academy video on rounding to the nearest 10. He references the actions taken in video two, so students would be best served if all three videos were shown in sequence.
Khan Academy
Rounding Whole Numbers Example 1, Arithmetic Properties, Pre-Algebra
Rounding is an essential skill that must be used throughout the study of mathematics. This Khan Academy video is the first in a series of three. It shows how to round the number 24,259 to the nearest hundred, using a number line.
Khan Academy
Example 4: Adding and Subtracting Polynomials, Algebra Basics
Adding two polynomials begins with simplifying when possible. Sal demonstrates the process he uses to combine like terms and explains why the process works. This video would be great for those who need a quick refresher.
Khan Academy
Evaluating an Algebraic Expression with Exponents
Here is the first video in a three-part series on evaluating exponential expressions. Sal Khan evaluates an exponential expression, reminding students to use PEMDAS while he demonstrates and explains his algebraic reasoning.
Khan Academy
Identifying Fraction Parts, Fractions, Pre-Algebra
Students observe Sal identify parts of a fraction. He draws a pentagon and 'cuts' it into five equal slices. Next, he removes two 'slices' and writes the remaining portion as a fraction, explaining what each part represents.
Khan Academy
Prime Factorization, Factors and Multiples, Pre-Algebra
Older elementary students will appreciate how clearly Sal explains how to find the prime factorization of 75. He shows the complete process, taking note of numbers that are and are not primes, and why.
Khan Academy
Decimal to Simplified Fraction, Decimals, Pre-Algebra
This video demonstrates how to write a decimal as a fraction and explains why it works. The concept is explained well and presented clearly and straightforwardly. Great for third or fourth graders.
Khan Academy
The Parts of Polynomial Expressions, Polynomial and Rational Functions, Algebra II
Use this video to build mathematical vocabulary through practical application. Sal breaks down the parts of a polynomial expression, identifying the coefficient and exponents while he defines them.
Khan Academy
Example 2: Multiplying a Binomial by a Polynomial, Algebra I
Sal completes a practice problem to reinforce and apply the concepts learned in previous Khan videos on multiplying polynomials. This would be a significant practice problem to do with your students.
Khan Academy
Example 6: Subtracting Polynomials with Two Variables, Algebra I
Sal beautifully explains how to subtract two polynomial expressions with multiple variables. He groups like terms and the distributive property to create a single expression.