Sometimes dealing with decimals is so much easier than dealing with fractions. The ninth activity in a 21-part module has the class consider situations when it might be easier to add or subtract fractions by first converting to...

In this column subtraction with three-digit worksheet, students solve fifteen subtraction problems with three-digit numbers using regrouping.

On the 124th day of school, young mathematicians are asked to find out how many days are left in the 180-day school year. The teacher version to the task offers several ways the problem can be solved, and can be used to guide...

Solve word problems with addition and subtraction without regrouping. Then test your knowledge.

A set of seven short tutorials on addition. Begins with a basic introduction to how addition works, and covers topics such as using a number line, place value, and regrouping.

Solve problems step by step by addition with regrouping.

Demonstrates how to regroup when adding 2-digit numbers.

Practice adding and subtracting mixed numbers with common (like) denominators. Some items require regrouping. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

[Free Registration/Login may be required to access all resource tools.] A video and practice questions on adding 3-digit numbers with regrouping. [1:32]

In this exercise, students practice subtracting two-digit numbers (no regrouping). Students receive immediate feedback and have the opportunity to watch a tutorial video, get hints, and try questions repeatedly.

Practice adding and subtracting mixed numbers with different denominators. Regrouping required.

[Free Registration/Login may be required to access all resource tools.] The video models how to add two-digit numbers using regrouping. The video is followed by practice problems.

Race to a win with this math game where students have to do addition with regrouping.

Practice adding and subtracting mixed numbers with different denominators. No regrouping required.

Practice adding and subtracting mixed numbers with common (like) denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Practice several different levels of difficulty of addition problems from single digit all the way up to 3 digit with regrouping. You can also choose single digit addition with negative numbers. When you are finished you can print your...

In this exercise, students practice subtraction within 1000. Students receive immediate feedback and have the opportunity to get hints, watch video tutorials, and try questions repeatedly. CCSS.Math.Content.3.NBT.A.2 Fluently add and...