What are the rules for subtracting positive and negative numbers?

A brain teaser,You are given the numbers 777, 888 and 999. Using the numbers once and adding, subtracting, multiplying. How can you make 999

  • You are given the numbers 777, 888 and 999. Using the numbers once and adding, subtracting, multiplying or dividing, how can you make 999?

  • Answer:

    999 - 777 ------ 222 -- ------ 888 - 222 --- ----- 666, which is 999 upside down.

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