Activity
CK-12 Foundation

Ck 12: Mental Math for Addition and Subtraction Equations

For Students 6th - 9th Standards
[Free Registration/Login Required] Students will use a real world example to solve single variable equations mentally. Click challenge me to answer a practice question and click learn more to watch a video.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 2.nbt One, Ten, and One Hundred More and Less

For Teachers 2nd Standards
In this lesson plan students will understand place value using addition and subtraction.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: Boys and Girls, Variation 1

For Teachers 1st - 2nd Standards
This word problem focuses on the Put Together/Take Apart contexts for addition and subtraction. Young scholars may use objects, pictures, or equations to represent their solutions. Examples and explanations are provided.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 2.nbt Many Ways to Do Addition 2

For Teachers 2nd Standards
This lesson plan has students exploring was to add and subtract numbers with multi-digits and place value.
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Khan Academy

Khan Academy: Add and Subtract Polynomials

For Students 9th - 10th Standards
Exercises for practicing adding and subtracting polynomials. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Professional Doc
Primary Resources

Primary Resources: Word and Real Life Problems

For Teachers Pre-K - 1st Standards
Are you looking for some problem solving activities to do with your class? Look no farther. This site includes games, worksheets, presentations in PowerPoint, and smartboard files.
Activity
K-5 Math Teaching Resources

K 5 Math Teaching Resources: Add and Subtract Ten on a Number Line [Pdf]

For Students 1st - 2nd Standards
Students will roll a die and follow the directions to explore adding and subtracting on a number line.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: Boys and Girls, Variation 2

For Teachers 1st - 2nd Standards
Students are asked to solve a word problem with both addends unknown. They will write an equation and draw a picture to use to explain their answer.
Unit Plan
E-learning for Kids

E Learning for Kids: Math: Snorkeling Great Barrier Reef: Number: Count to 20 and Comparison

For Students K - 1st Standards
Go snorkeling with Bill in the Great Barrier Reef and help him with some numbers in the sea!
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Khan Academy

Khan Academy: Add and Subtract Polynomials: Two Variables

For Students 9th - 10th Standards
Practice adding and subtracting polynomials. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Add, Subtract, and Multiply With Parentheses Missing Number

For Students 4th - 5th
[Free Registration/Login may be required to access all resource tools.] This is a video and practice problems demonstrate finding missing numbers using order of operations and working backwards. Operations include addition, subtraction,...
Unit Plan
Texas Education Agency

Texas Gateway: 3.3 Vector Addition and Subtraction: Analytical Methods

For Students 11th - 12th Standards
By the end of this section, you will be able to understand the rules of vector addition and subtraction using analytical methods, apply analytical methods to determine vertical and horizontal component vectors, and apply analytical...
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Khan Academy

Khan Academy: Addition & Subtraction: Find the Missing Value

For Students 7th
Practice finding the missing value in an addition or subtraction equation involving negative numbers.
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Khan Academy

Khan Academy: Addition and Subtraction Word Problems 2

For Students 6th - 8th Standards
In this exercise, students practice addition and subtraction word problems 2. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
eBook
CK-12 Foundation

Ck 12: Algebra: Addition and Subtraction of Radicals

For Students 8th - 9th
Learn how to simplify expressions involving the addition and subtraction of radicals.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Two Step Metric Capacity With Addition and Subtraction

For Students 3rd - 5th
[Free Registration/Login may be required to access all resource tools.] In this learning module, students must solve two-step word problems about metric capacity using addition and subtraction. The process is demonstrated in the...
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Mixed Operations Addition and Subtraction (Metric Capacities)

For Students 4th - 5th Standards
[Free Registration/Login may be required to access all resource tools.] For this learning module, students are asked to solve word problems involving the addition and subtraction of metric units of capacity. Includes video demonstrating...
Unit Plan
Scholastic

Scholastic: Study Jams! Math: Addition and Subtraction: Estimate Sum, Difference

For Students 3rd - 5th
Complete this step by step lesson to estimate the sum and difference then test yourself.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Only Using Addition or Subtraction Symbols

For Students 4th - 5th
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are presented with an equation where the operation signs are missing. They must find the correct order of addition and subtraction...
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Khan Academy

Khan Academy: Addition and Subtraction Word Problems 2

For Students 1st Standards
Practice solving more challenging word problems with addition and subtraction. Numbers used are 20 or less.
Unit Plan
CK-12 Foundation

Ck 12: Algebra: Addition and Subtraction of Rational Expressions

For Students 7th - 9th Standards
Learn how to add and subtract rational expressions.
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Khan Academy

Khan Academy: Matrix Equations: Addition and Subtraction

For Students 9th - 10th Standards
Solve equations where the unknown is a matrix, by using matrix addition and subtraction. Students receive immediate feedback and have the opportunity to try questions repeatedly or receive hints.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Add and Subtract With Negatives

For Students 9th - 10th Standards
Find a quick, concise explanation of how to add and subtract with negatives. Step by step examples are included to help you understand how to find the sum or difference when negative numbers are involved.
Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Sine Sum and Difference Formulas

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Sine of a sum or difference related to a set of cosine and sine functions. Here you'll learn to rewrite sine functions with addition or subtraction in their...

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