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Writing Digits

Age 5 to 7 Challenge Level:

Lee was recording some numbers:

What do you think she wrote next?
Why do you think that?

Click on the 'Show' button to find out.

She continued writing the counting numbers in order but she stopped for a rest after writing seventeen digits.
What was the last number she wrote?

She carried on until she got all the way up to the number 20.  
How many digits has she written altogether now?

Can you find a way to work this out without writing the counting numbers yourself?