Let our digital teacher explain why subtraction and addition are inverse operations, then see if you can answer the on-screen questions she asks.
Let our digital teacher show you how to add a three-digit number to a one-digit number, then have a go at some interactive activities.
Can you add a two-digit number and a one digit number? If not, let our digital teacher show you how. Then check you've mastered it by answering a few questions!
Let our digital teacher show you how to add a two-digit number and one-digit number under 20 in this tutorial, then answer some online questions to check you've got it!
Let our digital teacher show you how to calculate with negative numbers and then see if you can answer the questions she asks.