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Instructional Video

Math Mammoth: Add and Subtract Decimals Mentally (With Up to 3 Decimal Digits)

Curated by ACT

A lesson in how to add and subtract decimals to the thousandths place using mental math. [10:40]

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CCSS: Adaptable
Additional Tags
decimal addition, decimal operations, decimal subtraction, math mammoth: add and subtract decimals mentally (with up to 3 decimal digits)
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Classroom Considerations
  • This video is hosted on YouTube