Instructional Video

Math Mammoth: A Mental Math Trick: Addition With Nine and Eight

Curated by ACT

Learn a simple trick to help you add 9 or 8 to a number quickly, and how this can work with larger numbers ending in 9 or 8 as well. [8:59]

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CCSS: Adaptable
Classroom Considerations
  • This video is hosted on YouTube
Common Core