Comparing and ordering numbers

problem

Largest Number

Age

11 to 14

Challenge level

1 out of 3

What is the largest number you can make using the three digits 2, 3 and 4 in any way you like, using any operations you like? You can only use each digit once.
problem

Writ Large

Age

11 to 14

Challenge level

2 out of 3

Suppose you had to begin the never ending task of writing out the natural numbers: 1, 2, 3, 4, 5.... and so on. What would be the 1000th digit you would write down.
problem

Magical Products

Age

11 to 14

Challenge level

2 out of 3

Can you place the nine cards onto a 3×3 grid such that every row, column and diagonal has a product of 1?
problem

17s and 23s

Age

11 to 14

Challenge level

3 out of 3

Can you form this 2010-digit number...
problem

Pros and Cons

Age

14 to 16

Challenge level

2 out of 3

If p is a positive integer and q is a negative integer, which of these expressions is the greatest?
problem

Difference Sudoku

Age

14 to 16

Challenge level

3 out of 3

Use the differences to find the solution to this Sudoku.
article
Dot Card Games

These games devised by Jenni Way use dot cards which will help children see the structure of numbers 1-6 and give them confidence as they begin to add and subtract these numbers.
article
Activities on the Gattegno Chart

In this article, Alf outlines six activities using the Gattegno chart, which help to develop understanding of place value, multiplication and division.