A versatile way of generating random numbers which is excellent for use right through the primary school. Spin the numbers and choose the required calculation. Great for starter and plenary sessions. It also provides the answers to the calculations.

Activities to help children learn their number bonds to 10. There is a pairs game with number and picture prompts and problem solving using the number facts to 10.

Use these machines to practise the mental skills of number bonding. See which numbers make 5, 10 and 100 when they are added together.

A good tool for demonstrating addition to 10 on a numberline. There are two levels of difficulty.

Children will love this animated site which helps addition skills up to 20. It has teacher guidance on how it can be used.

Set your own time and music on this great countdown timer which is ideal for any activities which are time limited.

A useful teacher demonstration tool for demonstrating how units or tens are regrouped in addition sums with carrying.

A simple game where you need to add 10 to on a hundred square. It is best displayed on full screen.

Good number square activities involving counting on and counting back. There are different levels including adding tens and units.

Children will love monkey character in this game which has addition, subtraction, multiplication and division sums at 3 different levels.

Excellent for whole class addition mental maths. Levels are progressive from single digit addition to decimal addition and HTU and TU addition. It usefully presents sums in different ways.

A good demonstration tool for showing how TU and HTU mental addition can be made easier through the use of place value cards.

A good teaching tool for helping children understand vertical addition of TU and HTU.

A super activity for finding number bonds of the numbers up to 10. It is great for investigating different number bonds.

Complete the number bonds to set the whale free. You can choose different totals up to 10.

A beautifully illustrated animated site which can help children learn subtraction within 5 or 10. There is a facility for making your own subtraction sums within 10.

Simple 'take away' maths problems with rabbits. There are two levels, one has numbers to 10 and the harder one has numbers to 20.

The single step function machine adds or subtracts numbers to 10 or you can set your own function.

A function machine teaching tool with a range of very simple to complicated examples. It has accompanying teacher notes.

A teaching tool with instructions for demonstrating subtraction. It is useful for representing decomposition and works well on an interactive whiteboard.

Children need to count the aliens before some disappear and then have to work out how many have gone. It is good for subtraction sums with missing numbers.

A great tool for teaching finding the difference between two numbers. Useful for showing counting on for single digit subtraction and bridging tens.

A class bingo game where children need to work out 1 or 10 more or less. Good for developing maths vocabulary and mental arithmetic. Ranges from numbers to 20 to HTU.