This site teaches Statistics and Probability to 7th graders through a series of 475 questions and interactive activities aligned to 10 Common Core mathematics skills.
This site teaches Expressions and Equations to 8th graders through a series of 4712 questions and interactive activities aligned to 32 Common Core mathematics skills.
This site teaches Functions to 8th graders through a series of 1920 questions and interactive activities aligned to 17 Common Core mathematics skills.
This site teaches Geometry to 8th graders through a series of 2398 questions and interactive activities aligned to 19 Common Core mathematics skills.
This site teaches Statistics and Probability to 8th graders through a series of 303 questions and interactive activities aligned to 5 Common Core mathematics skills.
This site teaches The Number System to 8th graders through a series of 676 questions and interactive activities aligned to 6 Common Core mathematics skills.
This 6-minute video lesson looks at greatest common divisors.
This 7-minute video lesson looks at 2010 IIT JEE Paper 1 Problem 39.
This 7-minute video lesson continues to look at 2010 IIT JEE Paper 1 Problem 39.
This 3-minute video lesson concludes the discussion of 2010 IIT JEE Paper 1 Problem 39.
Short video which describes the difference between a sample and a population.
Much of statistics is based upon using data from a random sample that is representative of the population at large. From that sample mean, we can infer things about the greater population mean. We'll explain.
Sal shows examples of intersection and union of sets and introduces some set notation.
This 11-minute video lesson introduces conic sections.
Introduction to experiment design. Creating a hypothesis. Double-blind testing. Placebo effect.
Introduction to experiment design. Explanatory and response variables. Control and treatment groups.
Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit. Calculate the number of significant figures for an assortment of numbers.
We've learned about matrix addition, matrix subtraction, matrix multiplication. So you might be wondering, is there the equivalent of matrix division? And before we get into that, let me introduce some concepts to you. And then we'll see that there is something that maybe isn't exactly division, but it's analogous to it.
Sal introduces the famous and super important Pythagorean theorem! This lesson includes an introduction video followed by examples and practice problems involving finding the hypotenuse, finding a side, finding area of an isosceles triangle, and determining if a triangle is a right triangle. It is followed by a unit on Pythagorean theorem applications.
Sal checks whether the commutative property applies for matrix multiplication. In other words, he checks whether for any two matrices A and B, A*B=B*A (the answer is NO, by the way). Created by Sal Khan.