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Q: The answer to a math problem in the first grade of primary school. Can you summarize the calculation method of addition and subtraction within 100?
Addition calculation method:

One plus one, ten plus ten,

If the unit phase is greater than ten, keep one unit and enter 1 into ten to get ten.

Ten digits add ten, ten digits leave one digit, and one hundred digits add one digit to make one hundred digits.

Subtraction calculation:

Subtract one, subtract ten,

If the number of digits is not enough, borrow 1 of ten digits to make ten and then subtract it.

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