The key to this math riddle is realizing that the one place must be zero.
888 +88 +8 +8 +8 =1,000
888 +88 +8 +8 +8 =1,000
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8+8+8+8+8+8+8+8+8+8+8+8+8+8+8+8+......et… till you get to 992 then add one more eight and you have 1,000...
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888+88+8+8+8
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888+88+8+8+8
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It would be 8+8 but 125 times lol