More Primary School Maths Questions
05 April 2007, 03:53 PM
#1
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More Primary School Maths Questions
If a book contains the digit 3 exactly 99 times (e.g. 3, 13, 23, 30...33-this counts as two digits) what would the final page number be?
How could you find this out without writing every page number out?
How could you find this out without writing every page number out?
05 April 2007, 04:18 PM
#2
Use your head?
Probably a formula but it's too complex for Primary school.
20 occurrences per 100, but then you get the 300's
0-99 - 20
100 -199 - 20
200 - 299 - 20
300 - 399 - 110
etc
Think it's 335 give or take 1-2
Probably a formula but it's too complex for Primary school.
20 occurrences per 100, but then you get the 300's
0-99 - 20
100 -199 - 20
200 - 299 - 20
300 - 399 - 110
etc
Think it's 335 give or take 1-2
Last edited by KiwiGTI; 05 April 2007 at 04:20 PM.
05 April 2007, 08:36 PM
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As KiwiGTI says, 20 per 100 for the first three hundreds, so
0-299 = 60
Then 11 per 10 for 300-329
300-329 = 33 (total so far = 93)
330 = 2 (total so far = 95)
331 = 2 (total so far = 97)
332 = 2 (total so far = 99)
So the answer is 332
0-299 = 60
Then 11 per 10 for 300-329
300-329 = 33 (total so far = 93)
330 = 2 (total so far = 95)
331 = 2 (total so far = 97)
332 = 2 (total so far = 99)
So the answer is 332
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