Khan Academy
Dividing Fractions
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...
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Dividing Decimals 2.1
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.
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Multiplying Monomials by Polynomials
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.
Khan Academy
Rounding Whole Numbers 3
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.
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Rounding Whole Numbers 1
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.
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Converting Fahrenheit to Celsius
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.
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Adding Polynomials
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.
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Evaluating Exponential Expressions
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.
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Identifying Fraction Parts
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.
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Special Polynomials Products 1
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.
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Prime Factorization
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.
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Decimals and Fractions
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.
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Terms coefficients and exponents in a polynomial
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.
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Adding fractions with different signs
Have your students solve this word problem along with Sal. He adds mixed numbers to solve the problem and shows what to do if the mixed numbers have uncommon denominators.
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Dividing Monomials
Here is a quick look at how one could simplify a monomial expression involving division. Sal works a problem and briefly explains his process. Great as a concept review.
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Compound Inequalities 2
Practice solving compound inequalities by isolating an unknown variable. This is the second video in a series of four focused on solving compound inequalities.
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CAHSEE Practice: Problems 35-37
A few geometric problems test your students' knowledge of area and volume in questions 35-37 of the practice CAHSEE. Sal goes through the strategies and hints for solving the problems with helpful narration and colorful annotation, which...
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CAHSEE Practice: Problems 17-19
Taking students through problems 17-19 in this practice CAHSEE, the speaker illustrates how to solve problems involving reading data from tables, probability, and scatterplots. The speaker models careful question-reading and the...
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CAHSEE Practice: Problems 13-14
Probability and pie charts are the topics of problems 13-14 in this practice CAHSEE video, in which the speaker takes test review students through the work necessary to solve these problems. A teacher could present the video to a class...
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CAHSEE Practice: Problems 52-53
In the final two problems of the CAHSEE practice test, students are guided through algebraic equations involving factoring and reciprocals. This is a great resource for students who become confused by multiple choice questions, or who...
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CAHSEE Practice: Problems 23-27
Sal works through CAHSEE Practice test problems 24-27 in this video, which reviews line plots, graphs, and mathematical patterns. Colorful annotations help students with both understanding the question and modeling proper work and...
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CAHSEE Practice: Problems 20-22
Reviewing basic algebra and graphing skills, this video guides students through three practice math problems on the CAHSEE. Seeing the work and thought process behind choosing the correct answer in a multiple choice question format.
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Law of Large Numbers
Explaining "one of the most intuitive laws in mathematics and in probability theory," Sal begins a discussion on the law of large numbers. He clarifies that it is often misused due to its broad application. Students will appreciate his...
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Probability Density Functions
Beat the weatherman at his own game with this probability video! Sal shows students how to use probability density functions to predict random occurrences (such as rain). Probability problems - and inclement weather - are no match for...