Unit Plan

Khan Academy: Understand Subtraction as Adding the Opposite

Curated by ACT

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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CCSS: Designed
Classroom Considerations
  • Knovation Readability Score: 4 (1 low difficulty, 5 high difficulty)
  • The intended use for this resource is Practice
Common Core