Curated OER
How to Teach Kids Subtraction
Drawings, manipulatives, and household objects are great tools to use when teaching young learners how to subtract. This teacher tutorial describes solid practices for teaching first graders basic subtraction.
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...
Curated OER
What's the Subtraction Property of Equality?
A quick definition of the subtraction property of equality, this video could be used to introduce your class to the concept. Complement your lesson, or send learners home with the link to the video for further study.
Curated OER
What Are Some Words We Use To Write Inequalities?
Prepare your learners to comprehend word problems that involve different types of inequalities. This tutorial provides an overview of the common phrases used to describe compound inequalities and absolute value inequalities. With this...
Curated OER
What are Inverse Operations?
Explore inverse operations. Video viewers watch as a teacher shows how to "undo" an operation by using the opposite operation. By the end, learners should grasp that addition is the opposite of subtraction and division is the opposite of...
Curated OER
How Do You Subtract Mixed Fractions with the Same Denominator?
There are many ways to subtract mixed fractions. The teacher demonstrates one method of how to break up the mixed number and subtract the whole numbers apart from the fractions. Once that is complete she puts the whole number and...
Curated OER
How Do You Subtract Polynomials?
How the heck do you subtract polynomials? Well, watch the instructor and listen closely as she explains just what to do to subtract polynomials.
Curated OER
How Do You Rewrite Subtraction as Addition?
A quick look at how to write a subtraction as an addition problem. The first value stays the same and the second value becomes the opposite value which is added to the first.
Curated OER
How Do You Subtract a Positive Number from a Negative Number?
Subtract a positive number from a negative number. Switch the signs, add the terms, use absolute value, but leave the first negative outside. Confusing? Watch the instructor explain the steps to learn this method.
Curated OER
How Do You Add and Subtract a Bunch of Numbers with Different Signs?
So you have an expression of positive and negative numbers and you want to add and subtract them. Do you do the operations in order that they are written? Do you combine some? Do you move them around? Do you change their signs? The...
CK-12 Foundation
Ck 12: Adding and Subtracting Mixed Numbers Word Problems
[Free Registration/Login may be required to access all resource tools.] CK12- Adding and Subtracting Mixed Numbers - Word Problems is a video tutorial. [2:21]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Why Borrowing Works
This video shows subtraction of numbers up to four digits, and a recap of borrowing and regrouping. Practice problems are available. [8:34]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Level 4 Subtraction
This video teaches subtraction of up to five-digit numbers using borrowing or regrouping. Practice problems are available. [8:47]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: 2 Digit Subtraction
This video shows subtraction of two-digit numbers and place value to tens. [2:54]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Subtraction 3: Borrowing or Regrouping
A video covering a review of subtraction using a number line, followed by subtraction of numbers up to three-digits by using borrowing and regrouping. Practice problems available. [18:26]