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| Math Central | Quandaries & Queries |
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Question from Cameron, a student: Write the 2 digit number that matches the clues. My number has a tens digit that is 8 more than the ones digit. Zero is not one of my digits. My number is ________. |
Hi Cameron,
The digits are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.
The tens digit is larger than the ones digit, it's 8 more than the ones digit, so let's start with the ones digit.
Suppose the ones digit is zero. But that's not allowed.
Suppose the ones digit is 1, what is the tens digit?
Suppose the ones digit is 2, what is the tens digit?
Suppose the ones digit is 3, what is the tens digit?
Continue.
Penny
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