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4.NBT.2 – Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form. Compare two multi-digit numbers based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons.
Samples: Reducing numbers from their expanded form. Expanded Notation. Compare two three-digit numbers (< = >).
You can go to an overview of all the curricula here.
6.NA.1 – Apply additive and simple multiplicative strategies flexibly to:
6.NA.1.a – Combine or partition whole numbers, including performing mixed operations and using addition and subtraction as inverse operations
Samples: Write numbers – to 100,000. Reading numbers – to 100,000. Comparing numbers – to 100,000.