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Casting Out Nines: A Math Computation Checking Strategy

Curated by ACT

It's a mathematician's dream come true. An easy trick for checking mathematical computations, without a calculator! Believe it or not, it works with all four operations.

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CCSS: Adaptable
Additional Tags
check work, computation, math operations, number relationships, numerical patterns, problem solving, checking work
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Classroom Considerations
  • Knovation Readability Score: 3 (1 low difficulty, 5 high difficulty)