See how many people you can rescue. Click the number of tens and ones you need to move down the number line to the rescue. When you get there click the life preserver and then watch your rescue numbers add up.

This WebMath site shows how to add, subtract, multiply and divide through a step by step examples. The user simple selects the operation and types in two numbers, and the computer solves the problem through a step by step process. Also...

How far do I have to walk in order to make 1 mile? Students measure, add, and figure it out.

Practice breaking apart big addition problems using place value. For example, 234+567 is the same as 200+500+30+60+4+7. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive...

A step-by-step tutorial showing how to add 2-digit numbers in place value columns without regrouping. Includes exercises to try. CCSS.Math.Content.3.NBT.A.2 Fluently add and subtract within 1000

Step-by-step tutorial showing how to add 3-digit numbers in place value columns with and without regrouping. CCSS.Math.Content.3.NBT.A.2 Fluently add and subtract within 1000

[Free Registration/Login may be required to access all resource tools.] The video describes how to add zeros as place holders at the end of a decimal to make an equivalent decimal out to the thousandths place value in this example.

Great source for math worksheets on all four whole number operations, fractions, and miscellaneous arithmetic topics. Could be used to assess basic arithmetic skills for areas that need remediation.

You are on a trip and need to cross a bridge, but you have to pay tolls in coins. Solve this puzzle by making your way to the island only using 100 coins.

[Free Registration/Login Required] This flipchart is a multi-subject themed primary unit around the concept of oceans. Reading, Math, Science and Social Studies activities revolve around an ocean theme. In Part 3, students work on using...

The CyberSquad adds decimals to figure out how many rails they need to build a detour that will help them go around a mountain in this Cyberchase video segment.

You can use an abacus to count, add, subtract, multiply and more. Try this interactive abacus and see if you can make the numbers. Choose "here's more" for some clues. Good luck!

Students review addition while playing this two-player game. Players add ten to a given number. The first person to get five problems correct wins.

When subtracting ten from a 2 digit number, 2nd graders should be able to compute the answer as fluently and comfortably as do when they add ten to a 2 digit number.

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.

On this interactive site students practice addition and subtraction skills. At the end of the lesson students will be able to solve addition problems using a formal written algorithm and use various strategies to solve unfamiliar problems.

Base Ten BINGO is a fun educational learning activity for children to practice counting by one's, ten's, hundred's and thousand's. First children select the desired place value and grid size. Next, add up the blocks on the right and...

Add two numbers that are either whole numbers or written to the tenths place value.

This lesson will demonstrate how to add/subtract measurements and report the result to the correct number of significant digits. It is 2 of 3 in the series titled "Adding and Subtracting Using Significant Figures."

[Free Registration/Login Required] Use this flipchart as a short daily review. Modify the numbers in the flipchart to create enough pages for an entire year.

[Free Registration/Login may be required to access all resource tools.] Write and solve vertical addition problems with whole numbers.