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?
How many positive integers less than or equal to 4000 can be
written down without using the digits 7, 8 or 9?
How many six digit numbers are there which DO NOT contain a 5?
This article explains how credit card numbers are defined and the check digit serves to verify their accuracy.
Dotty Six is a simple dice game that you can adapt in many ways.
Dotty Six game for an adult and child. Will you be the first to have three sixes in a straight line?
A task which depends on members of the group noticing the needs of others and responding.
What is the last digit of the number 1 / 5^903 ?
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. . . .
What are the last two digits of 2^(2^2003)?
These interactive dominoes can be dragged around the screen.