Estimate and use inverse operations to check answers to a calculation
Inverse Operations - Addition and Subtraction
I designed this resource to help children to visualise the relationship between addition and subtraction. They can then use this relationship to solve missing number problems. There are a wide range of levels, from adding within 20 to using a calculator to add and subtract 5 digit numbers and decimals.
This game can be played for free until 1st August 2018, after which it will be available to subscribers only.
A fun game to practise mental addition skills. The game was designed to cover all the mental addition objectives in the new math curriculum. You can choose one objective, or choose all the objectives for a year group.