Common Core Standards Alignment

This worksheet supports the following Common Core State Standards for Mathematics:

• 1.NBT.B.2a See a group of ten ones as one unit called a ten.
• 1.NBT.B.2c Know that 10, 20, 30 and so on up to 90 mean 1 to 9 tens with no ones.
• 2.NBT.A.3 Read and write numbers up to 1,000 as digits, in words, and in expanded form (like 300 + 40 + 7).

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