Practice discovering and explaining patterns in multiplication tables. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints. CCSS.Math.Content.3.OA.D.9 Identify...

Practice rewriting subtraction problems as equivalent addition problems. For example, 2-9=2+(-9). Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Use bar graphs to solve addition and subtraction word problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a tutorial video, or receive hints.

Identify arithmetic patterns (including ones in the addition or multiplication tables), and explain them using properties of operations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a...

Practice addition and subtraction with complex numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

Analyze graphs that represent vector addition & subtraction. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.