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Broad Topics > Numbers and the Number System > Reading and writing numbers Six Times Five

Age 11 to 14 Challenge Level:

How many six digit numbers are there which DO NOT contain a 5? Lesser Digits

Age 11 to 14 Challenge Level:

How many positive integers less than or equal to 4000 can be written down without using the digits 7, 8 or 9? Mini-max

Age 11 to 14 Challenge Level:

Consider all two digit numbers (10, 11, . . . ,99). In writing down all these numbers, which digits occur least often, and which occur most often ? What about three digit numbers, four digit numbers. . . . The Codabar Check

Age 11 to 14

This article explains how credit card numbers are defined and the check digit serves to verify their accuracy. Sept 03

Age 11 to 14 Challenge Level:

What is the last digit of the number 1 / 5^903 ? Lastly - Well

Age 11 to 14 Challenge Level:

What are the last two digits of 2^(2^2003)?