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.

Practice telling which strategies work for adding two numbers within 100. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this exercise, students practice decomposing angles. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.

Find an angle's measure when given the measures of its parts. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Subtract whole numbers that are less than or equal to 1,000,000. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Practice counting by 10s. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Practice counting by 5s. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Practice counting by 100s. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.