Khan Academy
Khan Academy: Add Fractions With Unlike Denominators
Practice adding fractions that have different denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Other
Sumdog Teacher Portal: One More, One Less
This engaging lesson plan introduces students to basic addition and subtraction by adding or subtracting one. Teachers can create a free Sumdog account and usernames for their students to practice the skills through online learning games.
CK-12 Foundation
Ck 12: Elem Math: Adding, Subtracting, and Multiplying Missing Number
[Free Registration/Login may be required to access all resource tools.] A learning module where students must apply the order of operations to find the missing numbers in equations involving addition, subtraction, and multiplication. A...
Khan Academy
Khan Academy: Adding Decimals: Thousandths
In this exercise, students practice adding decimals in the thousandths place. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
Goodwill
Gcf Global: Addition and Subtraction
Learn the basics of addition and subtraction, then practice what you've learned using the interactives.
Fun Brain
Fun Brain: Soccer Shootout (Fractions and Whole Numbers)
Using fractions and whole numbers, score goals and block your opponent's goals by correctly answering addition, subtraction, multiplication, and division problems. Four levels of play--easy, medium, hard, and super brain--to test your...
Utah State University
Teacher Link Printable Teacher Aids
A huge collection of worksheets for addition, subtraction, multiplication, division, and handwriting practice all on PDF files ready for you to download and print for your students.
Scholastic
Scholastic Math Maven's Mysteries: The Mystery of Pirate Ringold's Lost Treasure
In this Math Maven mystery, read the legend of Pirate Ringold and his treasure and help Frieda Finditall figure out how much gold there is left to find on this old ship. Your knowledge about addition and subtraction with fractions will...
CK-12 Foundation
Ck 12: Elem Math: Adding Decimals From the Thousandths Place to the Tens Place
[Free Registration/Login may be required to access all resource tools.] This mathematics resource is a video demonstrating addition with decimals to the thousandths place, followed by practice problems adding numbers with digits in the...
Illustrative Mathematics
Illustrative Mathematics: Hitting the Target Number
The purpose of this task is to help students develop flexible strategies for adding and subtracting within 20. Students will pick 5 number cards from pre-made cards labeled 1-10. Then, another student will pick a "target number" between...
CK-12 Foundation
Ck 12: Elem Math: Adding Compound Units Metric Units
[Free Registration/Login may be required to access all resource tools.] Video and practice adding two compound units.
Arcademics
Arcademics: Spider Match Adding Integers
Spider Match is a multi-player game that allows students from anywhere in the world to compete against one another while practicing adding and subtracting integers!
Math Medics
S.o.s. Math: Complex Fractions/rules for Operations
A brief look at multiplying, adding, and subtracting complex fractions with links to rules.
Math Is Fun
Math Is Fun: Mathopolis: Fractions
Ten interactive questions on adding and subtracting fractions. Each question is supported by a detailed explanation of the solution.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Solving Inequalities
This site gives a short interactive quiz which allows students to self-assess their understanding of the concept of solving inequalities by adding and subtracting.
Illustrative Mathematics
Illustrative Mathematics: 1.oa Making a Ten
In this lesson plan, 1st graders are to use a table of sums to explore the relationship between adding and subtracting.
Illustrative Mathematics
Illustrative Mathematics: 1.oa Peyton's Books
This lesson plans explores adding and subtracting word problems. This is a complete instructional activity including attached items.
Illustrative Mathematics
Illustrative Mathematics: 7.ns Comparing Freezing Points
In this lesson plan, 7th graders compare freezing points by adding and subtracting rational numbers.
Illustrative Mathematics
Illustrative Mathematics: 7.ns Distances Between Houses
In this lesson plan, 7th graders determine the distance between houses by adding and subtracting rational numbers.
CK-12 Foundation
Ck 12: Elem Math: Fact Families Numbers to 1000
[Free Registration/Login may be required to access all resource tools.] The video shows how to determine the missing number sentence when adding and subtracting 3-digit numbers by using fact families.
K-5 Math Teaching Resources
K 5 Math Teaching Resources: Find the Missing Number [Pdf]
Students complete an activity to explore adding and subtracting by finding the missing number.
Better Lesson
Better Lesson: It All Adds Up With Time
The students are working on the concept of adding and subtracting time along with developing their own strategies to figure out elapsed time.
Khan Academy
Khan Academy: Combining Like Terms With Rational Coefficients
Practice combining like terms for expressions that have rational coefficients. This requires adding and subtracting fractions.
Khan Academy
Khan Academy: Combining Like Terms With Negative Coefficients & Distribution
Practice combining like terms using the distributive property. These problems involve adding and subtracting negative numbers.
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