Khan Academy
Order of Operations Example, Arithmetic Properties, Pre-Algebra
This resource shows how to evaluate complex statements using the order of operations. Mr. Khan explains that parentheses take precedence, followed by exponents, then multiplication and division, and finally addition and subtraction,...
Khan Academy
Recognizing Divisibility, Factors and Multiples, Pre-Algebra
The divisibility rules are invaluable tools to possess. Sal teaches students to recognize divisibility using the divisibility rules. He explains why 380 is divisible by some numbers and not by others. Tip: Create a handout on the...
Khan Academy
Finding Factors of a Number, Factors and Multiples, Pre-Algebra
If your class has watched the Khan Academy video on recognizing divisibility, they will have a good foundation for this video on finding factors. Sal demonstrates how to find factors of a number by using the divisibility rules and...
Khan Academy
How to Add Fractions that have Different Denominators, Fractions, Pre-Algebra
Your young mathematicians can solve this problem along with Sal. They will add 4/9 and 11/12 by finding a number that evenly divides both 9 and 12. Sal fully explains the process of finding a common denominator in an evident and...
Khan Academy
Example 1: Simplifying Polynomials, Algebra I
At times, polynomial expressions can be very long. Watch this video to see how Sal simplifies them by combining like terms. He explains his process and uses various colors to demonstrate why like terms are alike and why they can be...
Khan Academy
Dividing Whole Numbers and Fractions: T-Shirts, Fractions, Pre-Algebra
There is no better way to present a math problem than within the context of a story. Sal explains how he divides a fraction to solve a word problem where he must determine how many shirts can be made with 48 yards of fabric. Problems...
Khan Academy
Example 2: Finding the Square of a Binomial with One Variable, Algebra I
Sal demonstrates what not to do when simplifying a squared binomial. Next, he clarifies why they can't square each term individually and then add them. He uses his incorrect example as a starting point to demonstrate how to simplify a...
Khan Academy
U.S. Customary and Metric Units, Ratios, Proportions, Units, and Rates, Pre-Algebra
Expose your students to the differences and vocabulary associated with both U.S. Customary Units and Metric Units. Sal defines 14 different terms of measure and then sorts them into two categories. He has numerous small side notes that...
Khan Academy
Example: Expressing Division in Multiple Ways, Arithmetic
Sal takes this word problem apart piece by piece to demonstrate how to divide 18 by two. He underlines important information, determines what he needs to do to solve the problem, and then writes 18/2, three different ways. This resource...
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 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.