Subtracting with 4-digit numbers, ‘in your head’, sounds like a pretty tough task, but questions such as 6,004 – 5,999 can be done more quickly mentally than using written methods. You will find questions like this on a regular basis in our Daily Challenge as well as other skills such as rounding to the nearest million and calculating using negative numbers. We have many on-screen activities and worksheets to help with these tasks and have just added two new sets:

* rounding to the nearest million

* adding with negative numbers.

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