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How to calculate pre-school math 19 minus 12 in a simple way?
Take out 19 stick and 12 stick and demonstrate it again.

Then tell the students that they all have ten identical ones, so they just need to subtract 2 from 9.

That's easy, since the topic is addition and subtraction of ten digits, those who have that digit will definitely learn.

Just tell the students to try first and then talk about it in detail.