Mid-term examination of mathematics in the first volume of the third grade

Hello, I'm glad to answer your question: I regard the tenth "7" as "1".

The result is 70- 10 = 60.

The correct answer should be 283+60 = 343.

Therefore, when Xiao Mahu calculates a subtraction formula, he regards the tenth "7" of the minuend as "1" and the calculation result is 283. The correct answer should be (343).

Thank you, that's all.

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