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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.