# Category: Arithmetic Challenges

## Addition and Partitioning

The first stage of arithmetic is usually learning to put numbers together and take them apart. There are actually 2 main ways to put numbers together. We can do it with addition or multiplication. Here…

## Counting On and Counting Back

Number sense is the ability to work with simple numbers in a more sophisticated way that allows you to do more complicated things. We saw last week that on average we are not able to…

## Subitising

Subitising is the ability to see a number of objects. We can subitise up to 5 or 6 items that are not in a known order but not usually much more than that. This skill…

## Developing a Sense of 1 to 1 Correspondence

This is the simplest of ideas in maths. But like most things that seem simple, there is a lot that we assume or take for granted with this idea. It is good to make sure…

## Number adding triangle

There are a lot of challenges you can set with this simple structure and set of rules. The basic rules are: Each number must be the sum of the 2 numbers below it You can…