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 six digit numbers are there which DO NOT contain a 5?
How many positive integers less than or equal to 4000 can be
written down without using the digits 7, 8 or 9?
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.