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Obviously, to do a math problem, you have to subtract three. He regarded it as eight and got eight. What should be the correct number?
This is not only a reverse calculation method, but also a wrong solution method.

If you subtract 3 as 8, the result is 8, then subtracting 8 is 8, and this number is 8+8 = 16.

The correct result should be 16- 3 = 13.

Of course, it can also be understood that subtracting 3 means subtracting 8, and subtracting 8-3 =5. The result will be 5 less than the original, so the positive result is 8+ 5 = 13.

See, honey?

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