Whiteboard
ClassFlow

Class Flow: Adding Larger Numbers

For Teachers Pre-K - 1st Standards
[Free Registration/Login Required] This is a flipchart to introduce adding two-digit numbers with regrouping. Applicable for grades 2 and 3.
Activity
Teaching Treasures Publications

Teaching Treasures: Year Eight Timed Mental Math

For Students 3rd - 8th Standards
Improve your computation skills using this timed interactive worksheet.
Unit Plan
Lawrence Hall of Science

The Math Page: Skill in Arithmetic: The Meaning of Subtraction, and Mental Calculation

For Students Pre-K - 1st Standards
This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.
Activity
Teaching Treasures Publications

Teaching Treasures: Year Four Timed Mental Math (Page 2)

For Students 3rd - 5th Standards
Improve your computations skills in all four operations with this timed interactive worksheet. Solve ten problems in five minutes or less. Problems are presented in horizontal format and answers can be checked immediately. This worksheet...

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