4: Advanced Counting - Addition and Subtraction

Sam collects stamps. She has 34 stamps but gives 8 of them to her brother. How many stamps does she have left?

Student: Thirty-four... thirty-three, thirty-two, thirty-one, thirty, twenty-nine, twenty-eight, twenty-seven, twenty-six.
Teacher: How did you know when to stop counting?
Student: I kept track on my fingers.

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Students at the Advanced Counting stage understand that the end number in a counting sequence measures the whole set and can relate the addition or subtraction of objects to the forward and backward number sequences by ones, tens, etc.