Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 7)
Third graders use zero, four, and five to make as many three-digit numbers as possible. Sal explains that to make the largest number possible, one must put the largest number in the highest place. Each step and Sal's thought process is...
Khan Academy
MTEL Math Practice Test: 12-15
This video discusses prime factorization and prime or natural numbers. Sal shows viewers how to solve these problems and one with expressions representing a given volume.
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 11)
Solving two-step word problems is a great way to build strong critical thinking and creative problem-solving skills. This video showcases three-word problems involving multi-digit addition or subtraction. Sal highlights essential...
Khan Academy
MTEL Math Practice Test: 36-40
Sal goes into detail when solving these problems on the practice MTEL math test, especially the complicated details of question 36. Viewers will rest assured of the ease with which Sal addresses these increasingly tricky problems.
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 10)
Sal solves several practice problems in several ways to reinforce four-digit subtraction. He then takes viewers through solving word problems with four-digit subtraction, which requires regrouping. Use these problems as a class challenge...
Khan Academy
MTEL Math Practice Test: 41-45
Finishing up this practice MTEL Math test, Sal guides the viewer through questions 41-45, explaining his thought processes. The problem set in this video features skills such as median and mean, percentages, and probability, all of which...
Khan Academy
MTEL Math Practice Test: 5-8
In this video, covering questions 5-8, Sal demonstrates test-taking skills (reading a question properly, analyzing all possible choices) and pre-algebra-level skills. He guides viewers through problems involving simplifying expressions,...
Khan Academy
MTEL Math Practice Test: 9-11
This MTEL practice video focuses on problems 9-11, which include skill sets such as reading number lines and inequalities. Sal guides viewers through reading the question and working the equations with simple narration and colorful...
Khan Academy
MTEL Math Practice Test: 20-23
This video, helpful for even the most seasoned math teacher, demonstrates not only mathematical skills and equations but also the test-taking strategies necessary to choose the correct answer. On question 22, Sal explores an alternate...
Khan Academy
MTEL Math Practice Test: 24-27
In this video, Sal guides viewers through questions 24-27 of the MTEL Practice Math Test, showing them how to read the problems carefully and solve the equations correctly. He uses the process of elimination in a few questions, modeling...
Khan Academy
MTEL Math Practice Test: 28-30
Problems 20-30 of the MTEL Practice Math Test involve skills such as measuring rates and graphing equations. Sal helps viewers with the process of elimination in multiple-choice tests and explains how to solve various types of...
Khan Academy
MTEL Math Practice Test: 16-19
Providing quick lessons on lattice multiplication algorithms and inequalities, Sal takes viewers through problems 16-19 on the MTEL Practice Math Test. His calm and knowledgeable narration and easy-to-read annotations of each problem...
Khan Academy
MTEL Math Practice Test: 1-4
Are you worried about the MTEL? Never fear—Sal is here! Designed for adults seeking their teaching credentials in Massachusetts, this series of videos guides future teachers through a practice test for the Math MTEL. The valuable...
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 2)
As part of a series on numbers less than 10,000, a thorough presentation demonstrates how to visualize numbers in groups of a thousand. The instructor then describes how to read and write numbers less than 10,000.
Khan Academy
Singapore Math: Grade 3a, Unit 1 (Part 1)
Using a step-by-step approach, Sal from Kahn Academy visually describes what a group of 10, 100, and 1,000 means. It explores the value of numbers less than 10,000. The example is easy to understand. He puts marbles in a can, and the...
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 4)
Use the Singapore math methods to work through simple problems. Visual representations of word problems allow viewers to start making predictions and estimating the answers. This is a good way for class members to use various methods to...
Khan Academy
E2 E1 Sn2 Sn1 Reactions Example 3
Building on the previous video, Sal further explains different situations and the reactions that would occur in each.
Khan Academy
Chair and Boat Shapes for Cyclohexane, Organic Chemistry
After recapping the tetrahedral shape of a regular methane molecule and the standard 109-degree angles between hydrogens, Salman Khan demonstrates the chair and boat diagrams to represent cyclohexane. A primary focus of these diagrams is...
Khan Academy
Introduction to Reaction Mechanisms, Alkenes and Alkynes, Organic Chemistry
Starting with an example of how bromide might react with various alkenes, this lecture illustrates how valence electrons and electronegativity influence the likelihood of reactions.
Khan Academy
Naming Simple Alkanes, Organic Chemistry
Salman reviews the justifications for naming molecules based on their composition. He gives a valuable list of traditional prefixes and shows multiple examples of naming alkanes.
Khan Academy
Naming Alkenes Examples, Alkenes and Alkynes, Organic Chemistry
Sal "expands his repertoire" and starts to demonstrate the naming of long, complicated alkene chains.
Khan Academy
Representing Structures of Organic Molecules, Biology
Sal starts this video by looking at a traditional chain of carbons and working through the different ways they can be diagrammed.
Khan Academy
Carboxylic Acid Naming, Carboxylic Acids and Derivatives, Organic Chemistry
Sal draws out versions of carboxylic acids and justifies the naming procedures.
Khan Academy
Khan Academy: Phagocytes in Immunity
A description of nonspecific immunity, and the specific role of phagocytes. Understand how phagocytes engulf pathogens that enter the body as a line of defense. [16:19]