Activity
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: Subtracting Whole Numbers and Decimals

For Students 3rd - 8th Standards
If you are looking for a website that explains and defines subtraction with decimals you have arrived at an excellent resource. There are even practice problems at the very end of the lesson.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Subtracting Decimals by Inserting Place Holding Zeroes

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on how to subtract decimal numbers using place-holding zeroes. [1:48]
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Subtract Decimals From the Thousandths Place to the Tens Place

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] A video and practice questions on how to subtract decimal numbers from the tens place to the thousandths decimal place. [0:47]
Lesson Plan
Texas Instruments

Texas Instruments: A Maze Ing Secret Paths

For Teachers 1st - 4th
Students learn to add and subtract numbers Using the calculator. They investigate patterns in place value and explore relationships between numbers on the hundred chart.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Mixed Operations Selecting the Correct Sentence

For Students 2nd - 4th Standards
[Free Registration/Login may be required to access all resource tools.] The video shows how to add and subtract three digit numbers to determine which number sentence matches the correct solution. The video is followed by a series of...
Interactive
Mr. Martini's Classroom

Mr. Martini's Classroom: Inequalities: Addition and Subtraction

For Students 3rd - 5th
Students add or subtract two numbers to solve the inequalities on these interactive flashcards. The problem changes color when the correct symbol is chosen.
Interactive
Mr. Martini's Classroom

Mr. Martini's Classroom: Addition and Subtraction Comparitive Equations

For Students 3rd - 5th
Students add or subtract two whole numbers and compare the solutions using an inequality symbol. The problem on the flashcard changes color if the correct symbol is chosen.
Unit Plan
Khan Academy

Khan Academy: Subtract 2 and 3 Digit Numbers (No Regrouping)

For Students 1st - 3rd Standards
Practice solving problems like 452 + 241. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Khan Academy

Khan Academy: Subtract Within 1000

For Students 2nd - 4th
Subtract with 2 numbers less than 1000. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Khan Academy

Khan Academy: Add Within 100

For Students 1st - 3rd Standards
Practice adding two-digit numbers. All numbers in these problems are 100 or less. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Khan Academy

Khan Academy: Subtract 2 Digit Numbers (No Regrouping)

For Students 1st - 3rd
Practice solving problems like 45 - 24. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Khan Academy

Khan Academy: Subtract 1 Digit Numbers With Regrouping

For Students 1st - 3rd
Practice solving problems like 46-9. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
Khan Academy

Khan Academy: Subtract Within 100

For Students 1st - 3rd
Practice subtracting 2-digit numbers. 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: Challenge Flow Chart Numbers to 1000

For Students 2nd - 4th
[Free Registration/Login may be required to access all resource tools.] The video shows how to answer a series of addition or subtraction problems with numbers up to 1,000. The video is followed by practice problems.
Website
Discovery Education

Discovery Education: Web Math: General Math

For Students 3rd - 8th
An extraordinary site that will help you with your math homework. Presented in a format that is both easy to understand and educational. Navigate through numerous instant-answer, self-help math solvers to help you figure out your math...
Unit Plan
AAA Math

Aaa Math: Consumer Math

For Students 1st - 8th Standards
From basics such as adding and subtracting money, converting coins, and making change to more advanced topics such as sales tax and simple interest, this interactive tutorial offers help with consumer math issues.
Unknown Type
Mr. Martini's Classroom

Mr. Martini's Classroom: Negative Number Addition Subtraction Quiz

For Students 3rd - 8th Standards
Learners can test their knowledge of adding and subtracting positive and negative numbers with this interactive quiz.
Interactive
Math Is Fun

Math Is Fun: Balance When Adding and Subtracting

For Students 3rd - 8th
An interactive scale shows you how to deal with numbers and variables when solving simple algebraic equations.
Unit Plan
Khan Academy

Khan Academy: Adding Two Digit Numbers by Making Tens

For Students 1st - 3rd Standards
In this exercise, students practice adding two-digit numbers by making tens. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
Activity
National Council of Teachers of Mathematics

The Math Forum: Beat the Calculator!

For Students 3rd - 8th
Find more than 500 "mental calculation tricks" that will help you square numbers, add, multiply divide, subtract, and find percentages. A great resource for advance math students, gifted children, and teachers wanting to find ideas for...
Lesson Plan
University of Texas

Inside Mathematics: Apple Farm Field Trip [Pdf]

For Teachers 1st - 3rd Standards
This task challenges a student to use place value knowledge and understanding of operations.
Whiteboard
ClassFlow

Class Flow: Be a Problem Solver!

For Teachers 1st - 3rd
[Free Registration/Login Required] This flipcharts provides students with the opportunity to add and subtract 3 and 4 digit numbers. Students also will practice making change.
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Calculating Sums: Less Than, Greater Than, or Equal To

For Students 3rd - 5th
[Free Registration/Login may be required to access all resource tools.] Locate the video "Calculating Sums: Less Than, Greater Than, or Equal to Numbers (Numbers to 1,000)." In this learning module, students must add or subtract to find...
Interactive
Cool Math

Coolmath: Coolmath4kids: Weighing Fruits

For Students 3rd - 5th
Use the measuring scales to determine which of the three fruits is heaviest in each question. You may need to add or subtract the weights of other fruits to find out how much each fruit weighs!

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