# Numbers and Operations Teacher Resources

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Curated OER

#### How Do You Solve an Inequality by Dividing by a Positive Number?

Is your class working on inequalities? If so, you might be interested in this video. This well-made video shows how to solve an inequality by dividing by a positive number. An instructor details each step, writing out her work as she...

Curated OER

#### Cruising

Cruise ships offer many engaging opportunities for real-world math adventures. These large, floating cities use resources with numbers into the thousands place. Young mathematicians are asked to calculate numerical information relevant...

Shodor Education Foundation

#### Pythagorean Theorem

Most adults remember learning about the Pythagorean theorem, but they don't all remember how to use it. The emphasis here is on developing an intuitive understanding of how and when to use the theorem. Young mathematicians explore...

Illustrative Mathematics

#### Grass Seedlings

Plants never grow at the same rate, and that is the antithesis for this word problem involving multiplication of fractions. On the instructional activity, Raul notices that Pablo's seedlings are 1 1/2 times as tall, and Celina's...

Merck KGaA (Darmstadt, Germany)

#### EMD PTE

You can't tell by the title, but this is a functional periodic table of elements. Incorporating bright colors, lucid text, and easily operated features, this application serves as a valuable reference tool for your chemistry class.

Curated OER

#### How Do You Solve an Inequality by Dividing by a Positive Number?

Lorain County Community College

#### Fractions Part Three

See how well your mathematicians know their fractions with a challenging worksheet full of different problems. It's all there with adding, subtracting, multiplying, and division. They will be proficient with order of operations and...

Khan Academy

#### Challenge: Your First Button

Practice using conditional if statements, Boolean expressions, and Boolean operators by programming a user-selected button. This activity guides by using a small program that needs some modifications to work correctly.

Khan Academy

#### Government's Financial Condition

What goes into accounting the United States budget deficits and its net operating costs? How do shifts in the economy affect government spending? How is increasing interest projected to affect our federal debt in the future? This video...

Curated OER

#### Taxes and Sales

Collaborative discussions around this retail store problem will be taxing. Calculating discount and tax and the order of the operations are used to motivate an opportunity for learners to make a convincing argument using algebraic...

Curated OER

#### Using Random Sampling to Draw Inferences

Emerging statisticians develop the ability to make inferences from sample data while also working on proportional relationships in general. Here, young learners examine samples for bias, and then use random samples to make inferences...

Houghton Mifflin Harcourt

#### Unit 2 Math Vocabulary Cards (Grade 4)

The 28-page resource contains cards with terms relating to multiplication from inverse operations to front-end estimation to array. Each sheet contains two cards; one with the word and one with the definition.

EngageNY

#### The Multiplication of Polynomials

If you can multiply multi-digit integers, you can multiply polynomials. Learners use an area model to compare multiplying numbers to multiplying polynomials. They progress to using the distributive property.

Mathematics Assessment Project

#### Building and Solving Linear Equations

Young scholars write and solve linear equations in one variable based on descriptions of the operations that are applied to the unknown variable in an algebra machine. They then create their own problems for classmates to solve.

EngageNY

#### Writing and Evaluating Expressions—Multiplication and Addition

How many people can sit around a table? The 22nd part in a series of 36 continues the work on writing and evaluating expressions to include expressions with two operations. Pupils use models to determine an expression for the number of...

Kenan Fellows

#### Isotopic Pennies

Many people confuse atomic mass and atomic numbers. The sixth of seven lessons in a unit requires scholars to find the weight of different groups of pennies. Then, they must solve how many of each type of penny exists in a closed system...

Federal Reserve Bank

#### Episode 6: Circular Flow

Does it ever seem like the more money you get, the more you spend? A short video lesson introduces the concept of goods and services changing hands in a circular flow pattern. Scholars analyze how businesses make money from selling goods...

Cold Spring Harbor Laboratory

#### DNA Words Are Three Letters Long

DNA writes 64 different words but only codes for 20 different amino acids. Budding scientists learn about where each of these numbers come from and why they aren't equal with an online interactive. The resource explains the research, the...

Curated OER

#### Secret Sequences

Students are exposed to different types of sequences. in this sequencing lesson, students learn about simple sequences, multiplication sequences, declining sequences, the Fibonacci sequence and other sequences.

Curated OER

#### Complexity

Students perform mathematical operations on complex numbers. After a lecture/demo, students utilize a worksheet imbedded in this plan to gain practice performing operations on complex numbers.

Curated OER

#### A Beginning Look at Basic Algebra-Lesson 1-12

In this Algebra I worksheet, 9th graders explore the basic of beginning algebra: the order of operations, integer operations, translating phrases and sentences, and solving basic one-step equations. The six page worksheet contains...

Curated OER

#### Place Value: Calculator Work

In this place value worksheet, students solve 15 various math operation questions. The first 5 questions ask students to figure out the operation, using a calculator, that changes one number to another. The next 5 questions ask students...

Curated OER

#### Beary Good Problem Solvers

First graders role-play addition and subtraction operations with teddy bears. They practice with the bears first, then write and solve the problems.

Curated OER

#### Pigs and Ducks

Second graders use multiplication to solve problems. They use the multiplication facts for 2 and 4. Students combine operations to solve the problem and they devise and apply problem solving strategies.

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