There are six numbers written in five different scripts. Can you
sort out which is which?
Exploring the structure of a number square: how quickly can you put the number tiles in the right place on the grid?
What are the last two digits of 2^(2^2003)?
How many six digit numbers are there which DO NOT contain a 5?
What is the last digit of the number 1 / 5^903 ?
This article explains how credit card numbers are defined and the check digit serves to verify their accuracy.
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. . . .
How many positive integers less than or equal to 4000 can be
written down without using the digits 7, 8 or 9?
Dotty Six is a simple dice game that you can adapt in many ways.
These interactive dominoes can be dragged around the screen.
A task which depends on members of the group noticing the needs of others and responding.