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Page Numbers

Age 7 to 11 Short
Challenge Level

Josh of Alameda Middle School, Ampthill, Beds, sends the following solution:

The digits up to page 10 add up to 11.

Then from 11 to 20 they add up to 20, which takes the total to 31.

From 21 to 30 they also add up to 20, which takes the total to 51, and so on.

At 40 the total is 71, at 50 the total is 91, at 60 the total us 111, at 70 the total is 131, at 80 the total is 151, at 90 the total is 171, at 99 the total is 189.

Page 100 makes it 192.

Page 101 makes it 195.