Khan Academy
Adding Fractions with Like Denominators, Fractions, Pre-Algebra
Show your students this presentation to help them understand how to add fractions with like denominators. Sal adds 3/15 to 7/15 and then simplifies his answer. He uses drawings and multiple colors to show the actual process.
Curated OER
Basic Math: Lesson 6 - #10 - Subtraction of Fractions
This is a full lesson created to assist learners in subtracting mixed numbers and fractions. The instructor speaks quickly and fails to explain his thinking completely. He refers to LCD, completes problems involving negative numbers, 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...
Mathed Up!
Area of Compound Shapes
Scholars learn how to determine the area of compound shapes by finding the areas of the basic shapes that make it up. Pupils find the areas by adding areas together or subtracting them.
Khan Academy
Logarithmic Scale, Logarithms, Algebra II
In this thought-provoking video, Sal shows how a typical linear scale is different from a logarithmic scale. He plots numbers on both scales and compares them to show why the logarithmic scale is useful. This video gives an intuitive...
Khan Academy
SAT Prep: Test 7 Section 8 Part 4
Finishing this practice session, Sal takes care to address the last three problems, which are also the most complicated of the set. Problem 14 is a tricky algebra question that results in Sal plugging in the multiple choice answers to...
Socratica
Using Scientific Notation
Scientists and engineers in every field use scientific notation. The Socratica video explains what scientific notation is and why people use it. Then, it offers examples of how to convert a number into and out of scientific notation....
Khan Academy
Khan Academy: Adding & Subtracting Rational Numbers: 79% 79.1 58 1/10
Sal evaluates 79% - 79.1 - 58 1/10.
Khan Academy
Khan Academy: Adding and Subtracting 3 Fractions
Sal solves 1/4+3/5 -3/10 by rewriting each fraction to have a common denominator.
Math Mammoth
Math Mammoth: Review: Adding and Subtracting Whole Tens
This video goes over how to add and subtract multiples of ten to or from a 2-digit number. [8:14]
Math Mammoth
Math Mammoth: Adding and Subtracting Mixed Numbers
Demonstrates with visual models how to add and subtract mixed numbers. This is followed by examples with just numbers where the mixed numbers must be converted to a common denominator. There is also a word problem example. [10:16]
Khan Academy
Khan Academy: Addition and Subtraction Within 10
Sal solves addition and subtraction equations with number 10 or less. Includes a video, transcript, and question and answer section.
Khan Academy
Khan Academy: Algebra: Subtracting Polynomials With Multiple Variables
Demonstrates how to subtract polynomials when there are multiple variables in each polynomial. [2:10]
Imagine Learning Classroom
Learn Zillion: Solve Word Problems About Volume Using Number Line
In this lesson, you will learn how to solve word problems about volume by adding and subtracting on a number line. [4:10]
Khan Academy
Khan Academy: Adding 8+7
Demonstrates how to count pieces of fruit and make a group of ten to find the sum of 8 + 7. [3:18]
Khan Academy
Khan Academy: Adding 2 Digit Numbers Without Regrouping 2
Demonstrates how to add 23 to 45 using drawings of base ten cubes to represent 1s and 10s. [2:34]
Khan Academy
Khan Academy: Adding With Regrouping
Demonstrates how to add 35 to 27 using drawings of base ten cubes to represent 1s and 10s. [4:36]
Sophia Learning
Sophia: Multiplication and Addition Method: Lesson 10
In this lesson, you'll see the steps to using addition and subtraction to eliminate variable from a system of equations even without matching terms. It is 10 of 10 in the series titled "Multiplication and Addition Method."
Khan Academy
Khan Academy: Algebra: Adding Polynomials
Demonstrates how to add two given polynomials. One of the polynomials can be simplified before being added to the other polynomial. [2:10]
Khan Academy
Khan Academy: Algebra: Complex Numbers: Complex Numbers (Part 1)
Video first reviews what imaginary and complex numbers are. Shows example of graphing a complex number. Gives general explanations and formulas for adding, subtracting, multiplying and dividing complex numbers. Includes link to...
Sophia Learning
Sophia: Multiplication and Addition Method: Lesson 3
In this lesson, you'll see the steps to using addition and subtraction to eliminate variable from a system of equations even without matching terms. It is 3 of 10 in the series titled "Multiplication and Addition Method."
Sophia Learning
Sophia: Multiplication and Addition Method: Lesson 7
In this lesson, you'll see the steps to using addition and subtraction to eliminate variable from a system of equations even without matching terms. It is 7 of 10 in the series titled "Multiplication and Addition Method."
Sophia Learning
Sophia: Multiplication and Addition Method: Lesson 2
In this lesson, you'll see the steps to using addition and subtraction to eliminate variable from a system of equations even without matching terms. It is 2 of 10 in the series titled "Multiplication and Addition Method."
Sophia Learning
Sophia: Multiplication and Addition Method: Lesson 8
In this lesson, you'll see the steps to using addition and subtraction to eliminate variable from a system of equations even without matching terms. It is 8 of 10 in the series titled "Multiplication and Addition Method."