Addition combines two quantities to determine a total, represented by part–part–whole models, ten-frames, number lines, and equations with nonnegative addends whose sum is at most 10. The understanding includes zero, doubles, making 10, and the commutative relationship that changing addend order does not change the total; it also connects addition facts to related subtraction facts and distinguishes the total from each addend. Sums greater than 10, multi-digit computation, and more generalized symbolic treatment are outside this scope.
Addition means putting two groups together to find how many there are altogether.
Example: Find .
Here, and are the parts, and is the whole. You can switch the parts and get the same whole:
So, and both equal .
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