Worksheet
Math Salamanders Ltd.

Subtraction - Up to 20, Sheet 3

For Students 2nd - 3rd Standards
For this finding the differences worksheet, students subtract one-digit and two-digit from numbers to twenty. Students solve 40 problems.
Lesson Plan
EngageNY

The Power of Algebra—Finding Pythagorean Triples

For Students 10th - 12th Standards
The Pythagorean Theorem makes an appearance yet again in this lesson on polynomial identities. Learners prove a method for finding Pythagorean triples by applying the difference of squares identity. 
Worksheet
Curated OER

Subtraction

For Students 2nd - 3rd
Second and third graders use a number line and two of the numbers to determine the missing number. They solve 23 problems. An excellent worksheet!
Worksheet
Curated OER

Two-digit Addition and Subtraction

For Students 1st - 2nd
Often times we use tens and ones workmats to show how to add single and double-digit numbers. This worksheet has the labeled tens and ones columns built-in. Learners are provided with 16 charts, all you need to do is add the numbers.
Lesson Plan
Curated OER

Addition and Subtraction - First Grade

For Teachers Pre-K - 2nd Standards
Twenty-five multiple choice addition and subtraction problems fill the six-page worksheet. Many are word problems that include graphics to help learners visualize the situation. A useful tool in meeting Common Core standards!
Lesson Plan
Curated OER

Difference One Proton Makes

For Teachers 5th - 12th
Chemsitry aces learn that protons are located in the nucleus and the number of protons in the nucleus determines the atomic number of an element. In this lesson plan, they compare materials made up of a single element and other materials...
PPT
Curated OER

Around the World: Addition, Subtraction, Division, Multiplication

For Teachers 2nd - 4th
Kids love playing the game Around the World, and now you have a tool to make it even easier. Each slide contains a single addition, subtraction, division, or multiplication problem for learners to solve, the answer appears as you process...
Worksheet
Curated OER

Fourth of July Addition and Subtraction

For Students 2nd - 3rd
What is Thomas Jefferson signing? Focus on American history with this cross-curricular math puzzle. Learners utilize addition and subtraction skills to solve the mystery of the Fourth of July. All numbers are 3-digit, and there are no...
Interactive
CK-12 Foundation

Factor Polynomials Using Special Products: Difference of Two Squares

For Students 9th - 11th Standards
Factoring patterns are not magic! Show your classes how to model the difference of two squares' factors using an area model. Learners manipulate the width and length of two squares to represent the polynomial a^2-b^2. They use the model...
Interactive
CK-12 Foundation

Vector Subtraction

For Students 11th - Higher Ed Standards
Move vectors to determine their difference. Pupils use an interactive to visualize the opposite of a vector. They use the concept of adding vectors to subtract vectors by adding the opposite and, finally, view the differences of the...
PPT
Curated OER

2-Digit Subtraction

For Teachers 2nd - 3rd
Here is a presentation which shows forty-eight 2-digit subtraction problems. Learners solve the problems, but there are no answers or any kind of examples for them to practice from.
Worksheet
Curated OER

Length Addition and Subtraction Word Problems

For Students 1st - 2nd
Who has the tallest ice cream cone? Learners read two short word problems to compare the heights of various objects. Because these are paired with images, the objective is more of an image analysis than measurement addition and...
Worksheet
Curated OER

Subtraction

For Students Pre-K - 6th
In this subtraction learning exercise set, students find the differences in 480 problems; 24 per page. They subtract two digit numbers from three digit numbers regrouping when necessary.
Lesson Plan
Curated OER

Subtraction Relay

For Teachers 2nd - 4th
Students play a team subtraction game, subtracting two-digit numbers and using addition to check their subtraction. They solve subtraction problems at the board while the team solves the same problem in their seats.
Lesson Plan
Curated OER

Modeling and Recording Subtraction

For Teachers K
Students practice subtracting numbers from one through ten. In this subtraction activity, students use counters and a workmat to complete several subtraction problems on an overhead projector.
Lesson Plan
Curated OER

Two-Digit Subtraction With Regrouping

For Teachers 2nd - 3rd
Students practice their subtraction skills by solving 2 digit subtraction equations the teacher lists on the board. In this subtraction with regrouping lesson, students use the regrouping method to solve the 2-digit subtraction equations.
Lesson Plan
Curated OER

2 digit subtraction

For Teachers 2nd
Second graders subtract numbers 0 through 10 from 2 digit numbers using different subtraction methods. In this subtraction lesson plan, 2nd graders practice crossing out numbers in a number line, using a 10, and using their fingers to...
Worksheet
Curated OER

Subtraction Tree

For Students 3rd - 5th
In this math puzzle worksheet, students use their problem solving skills to respond to 6 questions that require them to use subtraction.
Worksheet
Curated OER

Writing Equations: Addition and Subtraction 0 to 20

For Students 2nd - 3rd
In these subtraction and addition worksheets, students write the equations for the addition and subtraction sentences. Students solve 28 problems.
Worksheet
Curated OER

Subtraction Practice Series- Worksheet 1

For Students 1st
In this subtraction practice worksheet, 1st graders find the difference in 36 lower elementary subtraction problems. There is an answer sheet given.
Worksheet
Curated OER

Subtraction Chart Exercise

For Students 1st - 2nd
In this subtraction worksheet, students solve ten problems in each of ten subtraction charts. Each chart has the facts of one number 0s-9s. Students time themselves for each subtraction chart.
Worksheet
Curated OER

Subtraction - Oral Questions

For Students 3rd - 5th
In this subtraction activity, students answer twelve 2-digit subtraction problems. The problems are example questions that are to be asked in oral form. For example, "What is 30 take away 12?" The answers are on the second page.
Lesson Plan
Curated OER

Subtraction with Counters

For Teachers 1st
First graders practice subtraction with manipulatives. In this subtraction lesson, 1st graders use M&M's to count and then take away. They write number sentences to match their subtraction problems.
Worksheet
Curated OER

Whole Number Subtraction: Level 6

For Students 2nd - 3rd
In this subtraction learning exercise, students will subtract hundreds. Students will need to borrow from the tens and thousands to solve these 12 problems.

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