Using known addition and subtraction facts

In order to solve a problem, we must visualise and represent it. Once we can see a problem, we know what to calculate. We can represent a problem in many different ways, including as bar models, ‘First, Then, Now’ models and equations. To calculate a solution, we can use a range of strategies. We can use our knowledge of addition facts to help us solve subtraction facts. We can use our knowledge of subtraction facts to help us solve addition facts.