The math teacher is in his thirties and the Chinese teacher is in his forties. What is the minimum difference?

2 years old.

The minimum difference is 2 years, because the math teacher is over 30 years old, and the maximum is 39 years old, while the Chinese teacher is over 40 years old, and the minimum is 4 1 year, so the minimum difference is 4 1-39 = 2 (years old), so subtraction is used.

Subtraction part name: minuend = difference+subtraction part name: minuend = difference+subtraction.

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