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How do you test that a kindergartener understands addition without asking them for things a calculator can do?

Or do we just think it’s not important for people to understand addition at this point?

You give them a bag of marbles and tell them to show you 5 marbles and 3 marbles and then show you how much there are when you put them all together. That's how I taught my kids addition.

You are missing the parent comment's point. Your question can also be answered using a calculator.

Don't tell my kids.

Your solution is to take away tools and ask to do a task under constant supervision? People take exams like this every day.

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