The Answer to Miss IBM's Alternative Addition!

There are all 8 math problems with their correct sums showing:

Problem #1

Problem #2

Problem #3

Problem #4

Problem #5

Problem #6

Problem #7

Problem #8

Although the digits change, the sums remain exactly the same for each math problem! The ones' digits of each addend alternate so that they add up to the same number! Out of all 8 of these math problems, the only one in which the hundreds' column digits change in the addends is Problem #8.

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© Derek Cumberbatch