Unit Plan
Khan Academy: Understand Subtraction as Adding the Opposite Unit Plan
Khan Academy

Khan Academy: Understand Subtraction as Adding the Opposite

For Students 6th - 8th Standards
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.
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Interactive
Mr. Martini's Classroom: Mr. Martini's Classroom: Adding Objects Interactive
Mr. Martini's Classroom

Mr. Martini's Classroom: Mr. Martini's Classroom: Adding Objects

For Students Pre-K - 1st Standards
Practice addition facts 1 to 9 with numbers and pictures in this interactive game.
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Lesson Plan
Better Lesson: Any Order Lesson Plan
Better Lesson

Better Lesson: Any Order

For Teachers 2nd Standards
The numbers in an addition number sentence (addends) can be added in any order and the sum remains the same.
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