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3.nbt - Number & operations in base ten

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Use place value understanding and properties of operations to perform multi-digit arithmetic.

3.NBT.1 - Use place value understanding to round whole numbers to the nearest 10 or 100.

3.NBT.2 - Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties...

3.NBT.3 - Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60).

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