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Math & Logic · Ages 10–12

Riddle #87

Using only the digit 8 and the plus sign, how can you add together eight 8s to make exactly 1,000?

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Open-ended riddle: think it through, then reveal the answer.

Answer: 888 + 88 + 8 + 8 + 8 = 1,000

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More Math & Logic riddles for Ages 10–12

#88 Pick any number. Double it, add 10, divide the result by 2, then subtract your original number. No matter what number you start with, you'll always end up with the same answer. What is it?
#89 Can you find three positive whole numbers where adding them together gives you the exact same result as multiplying them together?
#90 A bat and a ball together cost $1.10. The bat costs exactly $1.00 more than the ball. How much does the ball cost?

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