### There are 15 results

Broad Topics >

Numbers and the Number System > Reading and writing numbers

##### Age 5 to 11 Challenge Level:

Exploring the structure of a number square: how quickly can you put the number tiles in the right place on the grid?

##### Age 5 to 11 Challenge Level:

Dotty Six is a simple dice game that you can adapt in many ways.

##### Age 5 to 11 Challenge Level:

A task which depends on members of the group noticing the needs of others and responding.

##### Age 11 to 14 Challenge Level:

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

##### Age 11 to 14 Challenge Level:

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

##### Age 7 to 11 Challenge Level:

There are six numbers written in five different scripts. Can you sort out which is which?

##### Age 5 to 11 Challenge Level:

Dotty Six game for an adult and child. Will you be the first to have three sixes in a straight line?

##### Age 5 to 7 Challenge Level:

Can you find different ways of showing the same number? Try this matching game and see!

##### Age 5 to 11 Challenge Level:

These interactive dominoes can be dragged around the screen.

##### Age 5 to 7

While musing about the difficulties children face in comprehending number structure, notation, etc., it occured to the author that there is a vast array of occasions when numbers and signs are used. . . .

##### Age 5 to 7 Challenge Level:

What could these drawings, found in a cave in Spain, represent?

##### Age 11 to 14 Challenge Level:

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

##### Age 11 to 14

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

##### 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. . . .

##### 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?