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Math Problem Help Solving

Carin' For Seven

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Could someone please help me explain how to solve this problem to my kids. Thanks.


Sandy typed a six-digit integer' date=' but the two 9s she typed didn't show. If 2010 appeared, how many different positive six-digit integers could she have typed? One such integer to include is 920910.


Answer: 15[/quote']


Don't you just have to create 6 blanks:


__ __ __ __ __ __


And see how many ways you can plug TWO 9's into those blanks?

9 9 __ __ __ __

9 __ 9 __ __ __


And so on.....?



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