Not only do the questions have to be answered, but explanations given. These pages really show how well children understand what they are doing.

Lots of questions, most of which can be done mentally. The important thing is to explain how they were tackled.

Decide which operation is needed (add, subtract, multiply, divide) and whether a calculator, or pencil and paper are needed, or whether it can be done, 'in your head'.

More reasoning about number and place value.