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5:48
Lesson Planet

Find and Unknown in a Proportion 2

For Students 6th - 8th Standards
Find an unknown in a proportion part 2. 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...
1:51
Lesson Planet

Multiplying Whole Numbers and Applications 4

For Students 4th - 5th
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...
6:43
Lesson Planet

Changing a Mixed Number to an Improper Fraction

For Students 5th - 7th
The method of converting a mixed number to an improper fraction is fully explained in this video. Sal completely details how and why one is able to convert a mixed number. He uses multiple colors and drawings to demonstrate the...
2:50
Lesson Planet

Comparing Celsius and Fahrenheit temperature scales

For Students 5th - 7th
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...
8:59
Lesson Planet

Dividing Fractions

For Teachers 5th - 6th Standards
Here is an example problem that requires Sal to divide by the reciprocal. He demonstrates the process of dividing the fraction and rewriting it as a mixed number. Sal nicely explains why multiplying a fraction is the same as dividing it...
1:51
Lesson Planet

Dividing Decimals 2.1

For Students 5th - 7th
Occasionally, in mathematics, there are "short cuts" one can take. Sal explains a quick way to divide decimals numbers. He demonstrates that in certain cases, simply shifting the decimal point to the left will result in a correct answer.
2:43
Lesson Planet

Multiplying Monomials by Polynomials

For Students 7th - 9th
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 a wonderful job explaining this concept.
1:04
Lesson Planet

Rounding Whole Numbers 3

For Students 3rd - 5th Standards
Sal Khan completes the 3-part rounding series with this Khan Academy video on rounding to the nearest 10. He references the actions taken in video 2, so students would be best served if all three videos where shown in sequence.
4:23
Lesson Planet

Rounding Whole Numbers 1

For Students 3rd - 5th Standards
Rounding is an important skill which must be used throughout the study of mathematics. This Khan Academy video is the first in a series of 3. It shows how to round the number 24,259 to the nearest hundred, using a number line.
2:58
Lesson Planet

Converting Fahrenheit to Celsius

For Students 6th - 8th
Sal teaches students how to convert a temperature in Fahrenheit to its equivalent temperature in Celsius. He is explicit and very clear, which is good for those needing additional assistance or exposure to a particular topic.
2:10
Lesson Planet

Adding Polynomials

For Students 7th - 9th
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.
2:42
Lesson Planet

Evaluating Exponential Expressions

For Students 6th - 8th Standards
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.
2:47
Lesson Planet

Identifying Fraction Parts

For Students 3rd - 5th
Students observe Sal identify parts of a fraction. He draws a pentagon and 'cuts' it into 5 equal slices. Next, he removes 2 'slices' and writes the remaining portion as a fraction, explaining what each part represents.
2:30
Lesson Planet

Special Polynomials Products 1

For Students 8th - 10th
Some polynomials, when multiplied, result in a special product. Sal uses the distributive property to demonstrate the multiplication process. He then explains why some polynomials cannot be completely simplified.
4:09
Lesson Planet

Prime Factorization

For Students 5th - 7th
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.
2:42
Lesson Planet

Decimals and Fractions

For Students 4th - 6th
This video demonstrates how to write a decimal as a fraction and explains why it works. The concept is explained well and presented in a clear and straight forward way. Great for 3rd or 4th graders.