Simple Sum

Which number must be written in the place of the dots?

Remark: The missing number does not necessarily have 3 digits.

If you turn the paper around, the text will read:

… = 19969 + 68199
99106 = 18108 + 80998

Therefore, the missing number is 88168, which after 180 degrees rotation becomes 89188.

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  1. Perhaps you can put 5 dots instead of 3 which kind of forced me to think that answers should consist of 3 digits only.