Khan Academy
Singapore Math: Grade 3a Unit 2 (part 5)
What a great way to present multiple-digit addition! Sal adds the numbers 2803 and 1443. He draws a chart representing each of the four place values from the problem and then draws "place value buckets” to represent what each number...
Curated OER
Singapore Math: Grade 3a, Unit 2 (Part 7)
If you need to extend your four-digit addition example problems, this video is perfect. Sal provides a variety of practice problems firmly based on the place value system. Each problem is wonderfully explained using multiple colors and a...
Curated OER
How to Use an Abacus
Ever wonder how to use an abacus? Take a step back from the electronics and learn the basic elements with this short video. A student from Annunciation Catholic School explains how to express a number on the abacus. Note: Dialogue may be...
Curated OER
How Do You Solve a Multi-Step Inequality Using Reverse Order of Operations?
Investigate inequalities with this instructional video. A lecturer presents an inequality that will take multiple steps to complete and works through the problem step-by-step, numbering and labeling each action she takes. This video is...
Curated OER
How Do You Multiply a Two-Digit Number by a One-Digit Number?
The instructor uses diagrams to illustrate a model of how to multiply 3 times 26. Multiplication is a form of addition. She states that the larger rectangles represent 10 and the small squares have a value of 1. She explains how to get...
Curated OER
How Do You Determine Which Operations to Use in a Word Problem?
Word problems can be tricky. Lucky for you there are key words that can help you identify the operation needed to successfully complete any word problem. This tutorial helps you pick out key words and what those words indicate in terms...
Curated OER
How Do You Add Two Rational Expressions with Different Denominators?
Teach your class how to add two algebraic fractions with different denominators. The instructor in the video describes how to find the common denominator and demonstrates how to simplify the expression. A straightforward video, this...
Curated OER
What is Addition?
Cassandra (a student) does a great job defining the concept of addition. She provides a visually stimulating video, 4 examples of addition, and a full explanation of each example. A cute clip sure to educate and entertain.
Curated OER
Adding One-Digit Numbers
Your littlest learners will get a kick out of this math trick. The young lady in the video draws dots on each number and then counts them up. She correlates her method to images and explains all the numbers that can hold dots. This is a...
Curated OER
Adding Decimals (2)
Adding decimals can be as easy as following the steps. This short presentation shows what to do and what not to do when adding decimal numbers together. Note: There is no audio commentary with this presentation.
Curated OER
Addition Techniques
Charley and Professor Perez show us how to add numbers in a variety of ways. They use a number line to show how the various methods work. This clip shows learners that there are multiple ways to solve any addition problem. Intended for...
Curated OER
Primary Maths Addition
Learning new ways to look at basic addition problems can help young mathematicians better grasp place value, expanded form, and carrying. Watch the instructor add two and three-digit numbers together by breaking each number into tens and...
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 1)
A math video explores the terminology used to describe addition and subtraction using simple problems. The instructor uses visual means to describe these processes. Use it to cement understanding with both younger and older elementary...
Khan Academy
Singapore Math: Grade 3a, Unit 2 (Part 2)
By working through word problems involving subtraction and using numbers in the hundreds, the instructor uses visual cues to help viewers understand how to solve the problem. The instructor's method for solving the problem involves...
Curated OER
How Do You Add Two Rational Expressions with Different Denominators?
Teach your class how to add two algebraic fractions with different denominators. The instructor in the video describes how to find the common denominator and demonstrates how to simplify the expression. A straightforward video, this...
Curated OER
How Do You Solve a Multi-Step Inequality?
Investigate inequalities with this instructional video. A lecturer presents an inequality that will take multiple steps to complete and works through the problem step-by-step, numbering and labeling each action she takes. This video is...
Curated OER
How Do You Multiply a Two-Digit Number by a One-Digit Number?
The instructor uses diagrams to illustrate a model of how to multiply 3 times 26. Multiplication is a form of addition. She states that the larger rectangles represents 10 and the small squares have a value of one. She explains how to...
Curated OER
How Do You Add Like Terms?
Do you want to combine like terms the long way, or the quick way? Well, the instructor shows you both ways, and I bet you will prefer to combine like terms the quick way.
Curated OER
Adding Decimals
I'm so glad to hear Duane start this tutorial with the most important tip for adding decimals. He stresses the importance of lining up your decimals before you add. After that it's easy. You just add.
Curated OER
Mean, Median, and Mode
How many types of average are there? This video describes how to determine the mean, median, and mode of a set of numbers. Each type is worked through using one data set and the instructor shows the procedure for determining each.
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...
Curated OER
Singapore Math: Grade 3a, Unit 2 (Part 3)
Using three-digit numbers, this video discusses the process used to add and subtract with regrouping. The instructor also focuses on determining when and when not to regroup. It describes precisely what is happening when a problem...
Curated OER
What is a Multiple?
Multiplication is just repeated addition. Multiples are products of multiplying the same number, or of adding the same number repeatedly. It is useful to know about multiples to find least common multiples between numbers. Watch this...
Curated OER
How Do You Add Whole Numbers?
Adding whole numbers can be tricky if you don't get all your numbers in alignment. So make sure to get the place value correct.