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The Algebra Number Line above is aligned, either partially or wholly, with standard 3OA09 taken from the CCSM (Common Core Standards For Mathematics)  see the extract below). The resources below are similarly aligned.
Identify arithmetic patterns (including patterns in the addition table or multiplication table), and explain them using properties of operations. For example, observe that 4 times a number is always even, and explain why 4 times a number can be decomposed into two equal addends.
Similar to the above listing, the resources below are aligned to related standards in the Common Core For Mathematics that together support the following learning outcome:
Solve problems involving the four operations, and identify and explain patterns in arithmetic