It's hard to believe just how useful halving and doubling can be for a mathematician but trust me, it's is so good to be able recall these facts quickly.

Brie-Anna de Mouse, Star of Maths with a Mouse

DOUBLING & HALVING KIRFs

DH1 Derive doubles of whole numbers to 15, corresponding halves

DH2: Near doubles addition

DH3: Derive doubles of whole numbers to 50, corresponding halves

DH4: Double or halve any whole number to 100

ACTIVITY TIME

Take aim...fire! It's time to play Archery Doubles from ictgames.com

With three levels of challenge, this is a great starting point for practising doubling.

Level One: Doubles up to 10 + 10.

Level Two: Double multiples of 10 up to 100 + 100.

Level Three: Double any number up to 109

Nobody wants a bear with a sore head, a mouse with a tummy ache or a dinosaur with toothache. In Dinosaur Dentist (another great activity from ictgames.com), you will need to use your near doubles skills.

How?

Well, if you know double 2, you can simply add on one to find 2+3.

If you know double 7, you can simply add on one to find 7+8.

Alternativiely, if you know double 8, you can simply subtract one to find 7+8 .

For all your specific halving and doubling practise at speed, look no further than the class maths game that is Hit the Button. Wow! Just look at all those great choices below! Thanks Topmarks - top marks for you! A++++

I love a Quizzy Whizzy - have you seen my Quizzy Whizzy section?

It seems Transum loves a Quiz too! This is a little more challenging as it involves decinals but if you have great doubling skills already, you will be a boss in Doubling Quiz.

Looking for more ways to practise recalling your knowledge? click on Pick Your Skill. Check out my guide to see which games have options for the skills that you want to practise!