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Double Digit

Choose two digits and arrange them to make two double-digit numbers. Now add your double-digit numbers. Now add your single digit numbers. Divide your double-digit answer by your single-digit answer. Try lots of examples. What happens? Can you explain it?

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Not a Polite Question

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Whole Numbers Only

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Even Up

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2
Consider all of the five-digit numbers which we can form using only the digits 2, 4, 6 and 8.
If these numbers are arranged in ascending order, what is the 512th number?