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Lesson Plan
National Security Agency

Classifying Triangles

For Teachers 4th - 8th Standards
Building on young mathematicians' prior knowledge of three-sided shapes, this lesson series explores the defining characteristics of different types of triangles. Starting with a shared reading of the children's book The Greedy Triangle,...
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Activity
Computer Science Unplugged

Card Flip Magic—Error Detection and Correction

For Teachers 4th - 12th
I can find the error in an array of cards? After watching a demonstration class members search for the error is the provided cards. The resource provides a real-life example of using ISBN numbers in error detection and using check sums.
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Lesson Plan
EngageNY

Cyclic Quadrilaterals

For Teachers 9th - 12th Standards
What does it mean for a quadrilateral to be cyclic? Mathematicians first learn what it means for a quadrilateral to be cyclic. They then investigate angle measures and area in such a quadrilateral.
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Assessment
Illustrative Mathematics

Find the Missing Number

For Students 1st Standards
First graders are asked to find the missing numbers in subtraction and addition equations. Each missing number is represented with a box and appears as an addend, subtrahend, sum, or difference.
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Worksheet
Worksheet Web

Heteronyms

For Students 4th - 6th Standards
Challenge scholars to identify and use heteronyms in a sentence with a two-page worksheet designed to boost grammar skills. 
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App
Houghton Mifflin Harcourt

Sushi Monster

For Students 3rd - 6th Standards
These monsters are hungry for sushi and it's your job to feed them. Complete addition and multiplication equations to satisfy their needs while developing math fluency.
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Lesson Plan
Bob Prior

The Order of Operations

For Teachers 6th - 8th Standards
Your learners use many different number representations like positive and negative integers, exponents, radicals, and combinations of operations as they learn and strengthen their use of the order of operations. Thoughtfully organized to...
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Lesson Plan
EngageNY

Similar Triangles in Circle-Secant (or Circle-Secant-Tangent) Diagrams

For Teachers 9th - 12th Standards
First angle measures, now segment lengths. High schoolers first measure segments formed by secants that intersect interior to a circle, secants that intersect exterior to a circle, and a secant and a tangent that intersect exterior to a...
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Lesson Plan
EngageNY

Federal Income Tax

For Students 9th - 10th Standards
Introduce your class to the federal tax system through an algebraic lens. This resource asks pupils to examine the variable structure of the tax system based on income. Young accountants use equations, expressions, and inequalities to...
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Lesson Plan
EngageNY

Addition and Subtraction Formulas 2

For Teachers 11th - 12th Standards
Knowing the addition formulas allows for the calculations of double and half formulas. The fourth installment of 16 has the class use the addition formula to develop the double angle trigonometric formulas. Using the double formula,...
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Interactive
CK-12 Foundation

Multiplying Matrices by a Scalar

For Students 10th - 12th Standards
The rule is add before multiplying, even with matrices. Pupils use a slider to change the scalar multiplying the sum of two matrices. The interactive displays the resulting solution matrix, and requires scholars answer five questions...
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Worksheet
Novelinks

Zach’s Lie: Magic Squares

For Students 6th - 8th Standards
Individuals match vocabulary words within a magic square, a concept that ties in nicely with math class. The words are all located in Zach's Lie and were specifically selected to increase comprehension of the text. Fifth in a series of...
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Interactive
CK-12 Foundation

Addition of Integers: Number Blocks

For Students 3rd - 8th Standards
A five-question interactive provides a horizontal number line where integers are stacked on top of one another to find solutions of addition problems. Mathematicians move numbers to the numbers line, as numbers build higher, the sum of...
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Worksheet
Curated OER

Easter Eggs in a Basket - Sums to 18 (C)

For Students 1st - 2nd
In this addition worksheet, students solve the single digit addition equations. Students then color the Easter eggs in the basket that match the equation with sums greater than 11. Students solve 20 problems.
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Worksheet
Curated OER

Easter Addition (Sums to 100)

For Students 3rd - 5th
In this addition worksheet, students add integers and place the answer in the egg. All numbers are between 10 and 99. This one-page worksheet contains 25 problems. An answer sheet is included.
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Worksheet
Curated OER

Easter Eggs in a Basket-Sums to 50 (D)

For Students 2nd - 3rd
In this Easter-themed addition practice worksheet, students sharpen their math skills as they solve 31 problems that require them to add 1 and 2-digit numbers.
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Lesson Plan
Curated OER

Lesson #110 Volumes of Solids of Revolution (Disk Method)

For Teachers 7th - 12th
Students examine volumes of solids of revolution. In this volumes of solids of revolution activity, students use the limit of a Riemann sum to find the volumes of disks or cylinders and a sphere.
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Worksheet
Curated OER

Magic Math Morning Work

For Students 1st - 2nd
In this fact families worksheet, students solve 10 problems in which single digits are added with sums to ten. Students then check each problem using subtraction.
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Activity
Illustrative Mathematics

Words to Expressions 1

For Teachers 5th Standards
Designed as a follow-up to the lesson plan titled Watch Out for Parenthesis 1, this activity asks young learners to write an equation for the calculation described with words rather than numbers and symbols. The treasure that 5th graders...
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Lesson Plan
Improving Measurement and Geometry in Elementary Schools

The Sum of the Interior Angles of a Polygon

For Teachers 4th - 5th Standards
Junior geometers discover that polygons can be decomposed into triangles and that the number of triangles can be determined by a rule. Note that the Geometer’s Sketchpad® software is required to carry out all components of this lesson. 
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Worksheet
Curated OER

Using 10 to Add 7, 8, and 9

For Students 1st - 2nd
In this adding worksheet, students learn to make a ten when adding the numbers 7, 8,or 9. After looking at the examples, students solve 10 problems with addition facts.
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Lesson Plan
Curated OER

How to Use the Rules of Divisibility and Estimation

For Teachers 3rd - 5th
Number patterns help your kids learn divisibility and estimation rules. This activity aims to strengthen their math fact memorization skills by presenting several rules they are expected to memorize through practice.
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Lesson Plan
Curated OER

Estimating Solutions to Word Problems

For Teachers 4th
Learners use estimation to determine the answers to word problems by rounding whole numbers. In this estimation lesson plan, pupils compare and contrast solutions using the best answer.
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Worksheet
Curated OER

Addition

For Students 1st - 2nd Standards
Looking for some straightforward addition practice? You found it! Mathematicians calculate sums between double-digit addends, using examples as guidance. There are 12 problems total. Next, they answer two simple addition word problems....

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