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One day, Lee decides to write down the numbers   1, 2,..... 999

How many digits did Lee write, in total?

 Jan 29, 2020
edited by Guest  Jan 29, 2020
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1-9 =9

10-99 = 90 x 2

100-999 = 900 x 3        add the red to find total digits

 Jan 29, 2020

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