# Number Crunch Challenge

Counting in 2’s, 5’s and 10’s needs lots of practise but can be made more fun by counting coins, pairs of socks, fingers, toes, or any other objects that you have at home.

Number facts need a little more explanation…

Children need to know the bonds for numbers all the way up to 20, along with their corresponding subtraction facts.

As an example, here are the bonds to 5…

0 + 5 = 5

1 + 4 = 5

2 + 3 = 5

3 + 2 = 5

4 + 1 = 5

5 + 0 = 5

We get the corresponding subtraction facts by making ‘fab sets of 4’ like this…

2 + 3 = 5

3 + 2 = 5

5 – 3 = 2

5 – 2 = 3

Start with one fact, e.g.  2 + 3 = 5    and then ‘flip it over’ to get    3 + 2 = 5

Start with the biggest number to make the subtraction facts…

5 – 3 = 2   and then   5 – 2 = 3

The children are beginning to get the hang of this!

As children develop these ‘known facts’ they use them to calculate rather than relying on counting fingers and cubes. It’s much faster and more reliable! Once they grow in confidence they start linking them together (often without us having to teach them) e.g.

If I know that   5 + 4 = 9   then I also know that   15 + 4 = 19   and   50 + 40 = 90!

You will find links to some useful and free online games under the Year 1 page on the school website. In particular, there is a link to the Abacus website which has some fantastic games that the children have been using in class. Please see your child’s class teacher for a logon that can be used at home.

The prize basket is now fully stocked, so please help us to create happy, confident and rewarded mathematicians!

We have also created this list of useful resources for you.

Any questions, please contact Mr Dunn, Mrs Walker or Miss Ackerman.