# Arithmetic and Pre-Algebra Teacher Resources

Most elementary and middle schools just call this "Math". Here we cover everything from counting, number operations, and fractions to evaluating basic expressions and equations. All of this adds up to preparation for the eventual study of Algebra.
Showing 1 - 24 of 270 resources
3:54
Lesson Planet

#### What is the Opposite, or Additive Inverse, of a Number?

For Teachers 7th - 9th
Teach your class about the additive inverse! Using examples first and a definition second, this video explains what the additive inverse it and how to find the additive inverse of any given number or variable. A quick concept review for...
9:21
Lesson Planet

#### Addition Techniques

For Teachers 4th - 6th
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...
Lesson Planet

#### Review of Pre-Algebra

For Students 7th - 9th
Middle and high schoolers review topics covered Pre-Algebra. They solve problems questions dealing with exponents, square roots and absolute value. They use the rules of divisibility and identify prime numbers. This two-page on-line...
4:18
Lesson Planet

#### How Do You Find the Additive Inverse of a Polynomial?

For Teachers 6th - 12th
Finding the additive inverse is not as complicated as you might think. The instructor demonstrates how to multiply each of the terms in the polynomial by -1 and explains how this works. But wait, there's a quicker way. What's that you...
3:48
Lesson Planet

#### How Do You Solve an Equation With Fractions With The Same Denominators Using Addition?

For Teachers 8th - 11th
You have an equation with an unknown variable and fractions. How do you solve this kind of equation? You can do it using the addition property of equality to first isolate the variable. Then, combine the fractions and since they have a...
2:21
Lesson Planet

#### How Do You Solve an Equation Using Addition?

For Teachers 6th - 12th
The teacher demonstrates how to use the addition property of equality, applying it to both sides of the equation to find the solution.
Lesson Planet

#### Simplify Algebraic Fractions by Factoring

For Students 9th - 12th Standards
A brief presentation with laser-like focus, this video talks young mathematicians through the mechanics of simplifying algebraic fractions by factoring trinomials. While the factoring itself is assumed to be a mastered skill, the steps...
Lesson Planet

#### Simplify Algebraic Fractions by Factoring 2

For Students 9th - 12th Standards
Take your class through the mechanics of simplifying algebraic fractions by factoring trinomials. Though the steps for factoring are assumed known, the process of identifying and canceling common factors are detailed with care and...
Lesson Planet

#### Pre-Algebra Equations

For Students 3rd - 4th
In this solving pre-algebra addition equations activity, students use the sum and one addend to find the missing number. Students solve 10 problems.
1:44
Lesson Planet

#### How Do You Rewrite Subtraction as Addition?

For Teachers 6th - 12th
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.
1:25
Lesson Planet

#### What's the Addition Property of Equality?

For Teachers 6th - 12th
A basic definition of the addition property of equality. Use this video to recap a lesson on the addition property of equality, or have learners use it as a reference tool when they are working at home.
1:44
Lesson Planet

#### How Do You Solve an Equation Using Addition?

For Teachers 6th - 9th
The teacher demonstrates how to use the addition property of equality, applying it to both sides of the equation to find the solution.
3:43
Lesson Planet

#### How Do You Find the Additive Inverse of a Polynomial?

For Teachers 8th - 9th
Finding the additive inverse is not as complicated as you might think. The instructor demonstrates how to multiply each of the terms in the polynomial by -1 and explains how this works. But wait, there's a quicker way. What's that you...
1:15
Lesson Planet

#### What's the Addition Property of Inequality?

For Teachers 6th - 9th
The addition property of inequality is just like the addition property of equality. They each state that whatever is added to one side of the equation or inequality must be added to the other side. Watch this video and see how the...
3:25
Lesson Planet

#### How Do You Solve a Decimal Inequality Using Addition?

For Teachers 8th - 9th
In order to solve this inequality use the addition property of inequality to isolate the variable. Don't forget that these are decimal numbers. So be sure to line up the decimals according to the rules of adding decimals.
2:42
Lesson Planet

#### How Do You Solve an Inequality Using Addition?

For Teachers 6th - 12th
Use the addition property of inequality to solve this problem. It's just a one step solution and then the instructor shows how to write the answer in set builder notation.
Lesson Planet

#### Pre-Algebra Basic Operations: Decimals

For Students 6th - 7th
For this pre-algebra decimal worksheet, students complete a total of 28 problems performing multiplication, division, subtraction and addition of decimals and fractions.
Lesson Planet

#### Arithmetic Commutative Property of Addition 4 Worksheet

For Students 1st - 3rd
Build strong algebraic reasoning skills as well as an understanding of the commutative property of addition. Learners work to solve 16 single digit addition problems using the fabulous commutative property.
Lesson Planet

#### Arithmetic Commutative Property of Addition 2 Worksheet

For Students 1st - 2nd
Here is a practice sheet perfect for building foundational math skills while providing structured practice. Learners solve 16 single digit math problems using the commutative property of addition.
Lesson Planet

#### Basic Math Addition of Decimals

For Students 3rd - 4th
For this addition of decimals worksheet, learners complete a set of 16 simple problems. Page has multiple links to additional resources.
Lesson Planet

#### Arithmetic Addition of Decimals 1

For Students 3rd - 4th
In this addition of decimals worksheet, students complete a set of 16 simple problems using decimals to the hundredths place. Page has multiple links to additional resources.
2:20
Lesson Planet

#### How Do You Use Addition to Solve an Inequality Word Problem?

For Teachers 8th - 10th
Word problems. Inequalities. Money. What? Does Marissa have enough money left in her bank account to go to the movies? One variable, two given amounts. Set up this inequality to determine how much Marissa needs to have in her bank...
Lesson Planet

#### Writing Task 6.EE.4 Item 2

For Students 5th - 6th Standards
Young mathematicians demonstrate their knowledge of algebraic expressions with this short writing exercise. Using their understanding of multiplication as repeated addition, learners must explain in writing whether or not two given...
Lesson Planet

#### Writing Task 6.EE.4

For Students 5th - 6th Standards
Assess the mathematical reasoning of young learners with this quick writing exercise. Presented with with two algebraic expressions, young mathematicians must explain whether or not they are equivalent using their understanding of the...