Curated OER
Numbers Make Sense
Second graders explore number values by completing estimation problems in class. In this place value lesson, 2nd graders identify the use of decimals in numbers and how they relate to fractions or parts of a whole. Students utilize flash...
Curated OER
Solving One-Step Equations
Ninth graders explore the concept of a simple equation. They use addition and subtraction in one step in order to find balance to both sides of the equation. Students are encouraged to succeed using positive praise at the beginning of...
Curated OER
How Tall Is It?
Students identify how tall a tree is. In this measurement lesson, students use "luminometers" to measure a tree and complete a data sheet.
Curated OER
Using Basic Operations in Word Problems
Young scholars review basic operations and use them to solve word problems. In this word problems lesson, students review basic mathematical operations such as addition, subtraction, multiplication, and division. Young scholars then...
Curated OER
Positive and Negative Numbers
High schoolers discover negative numbers and how to use them by using the number line and the "team" method.
Curated OER
Eating on a Budget
Students are "given" $25.00 to spend at a restaurant. Using the Internet, they must "order" a complete 4 course meal while staying within their budget.
Curated OER
Magic Sum
Students calculate two-digit addition problems. They observe a teacher-led demonstration, and solve various problems independently.
Curated OER
Decimals: Collaborative Lesson
Students explore mathematics by participating in a group activity. In this number value lesson, students identify the uses for decimals and how to best estimate whole numbers based on decimals and fractions. Students collaborate with...
Curated OER
Arithmetic: Revision
Students practice with a variety of simple equations involving addition, subtraction, multiplication and division. Explanation is followed by each block of equations given to solve. They are set loose to complete additional equations for...
Curated OER
Charles Darwin's Hardware Shop
Young scholars construct an evolutionary tree representing specialization, diversity, and selection using easily obtained materials. They use at least twenty pieces of hardware to classify then develop "evolutionary" relationships...
Curated OER
It Counts
Students understand and reinforce how numbers are assigned to objects, as well as think about more, less, or equal values. In this lesson, students are asked to describe, compare, and classify plants. They should be able to use numbers...
Curated OER
Finding the Salt Front
Learners discuss definitions of estuary, salinity, and the salt front. They listen as the teacher explains the Hudson River Miles and ways the upriver and downriver sections relate to the north and south. Students graph the salt front...
Curated OER
The Nature of Mathematics
Students work in groups to describe plants using numbers. In this number lesson, students use numbers to define plants and then use numbers to write descriptions of themselves.
Curated OER
Introduction: Time Word Problems
In this word problems activity, students read through 2 time word problems and the answers to each problem. They then solve 2 time word problems on their own.
Scholastic
Scholastic: Study Jams! Math: Relate Adding, Subtracting
Watch a short video on the relationship between addition and subtraction then assess your knowledge with practice questions.
TED Talks
Ted: Ted Ed: How to Organize, Add and Multiply Matrices
When you're working on a problem with lots of numbers, as in economics, cryptography or 3D graphics, it helps to organize those numbers into a grid, or matrix. Bill Shillito shows us how to work with matrices, with tips for adding,...
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Add and Subtract Fractions
This Math Page tutorial explains how to add and subtract fractions and features a practice section at the very end of the lesson.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Adding and Subtracting Unlike Fractions
This site gives a short interactive quiz which allows students to self-assess their understanding of the concept of adding and subtracting unlike fractions.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Adding and Subtracting Like Fractions
This site gives a short interactive quiz which allows students to self-assess their understanding of the concept of adding and subtracting like fractions.
Texas A&M University
Wtamu Virtual Math Lab: Beginning Algebra: Adding and Subtracting Polynomials
A tutorial as an introduction to polynomials. Basic terminology and simple algebraic manipulations. Offers discussions and practice exercises with answers and explanations.
Shmoop University
Shmoop: Fractions & Decimals: Adding & Subtracting Decimals
The mathematics notes investigate how to add and subtract decimals. Examples and practice problems with solutions are included.
Khan Academy
Khan Academy: Adding and Subtracting Polynomials Review
Adding and subtracting polynomials is all about combining like terms. In this article, we review some examples and give you a chance for you to practice the skill yourself.
Math Is Fun
Math Is Fun: Adding and Subtracting Time
Students learn how to add and subtract time. Class notes and practice problems with solutions are provided.
Lawrence Hall of Science
The Math Page: Skill in Algebra: Adding and Subtracting Signed Numbers
Here is a site that clearly and thoroughly explains how to add and subtract signed numbers. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this site out to students who...