This is the fourth question on page 5 of the first volume of second grade mathematics.

Solution: 63-36=27 =9*(6-3)

54-45=9 =9*(5-4)

64-46= 18 =9*(6-4)

After the position of any two-digit number is reversed, the difference with the original number is equal to 9 times the difference between the original ten-digit number and the single-digit number.

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People's Education Edition, the first volume of ninth grade mathematics textbook, page 12, question 1- 10!

How many columns of mathematical robots are there in the first grade of primary school?

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Ray, a math teacher in Luo Yang No.32 Middle School, wrote a 2000-word check because he didn't get the grade assigned by the teacher.