Posted by Peter on 17th November 2007

Free Y6 maths worksheets: Mentally add 3-digit numbers

graphic calculationsWow! Now this does need some concentration, but is by no means impossible.

Let’s look at an example: 239 + 421

First of all it’s nearly always easier to start with the larger number, so let’s reverse the question.

421 + 239.

Now, start with the 421 and add on 200 to make 621.

Take the 621 and add the tens, that’s 30 to make 651

Finally add 9 to the 651 to make 660.

It can be done!!

Sometimes children may need to make jottings: write down the answer to each stage of the question.

There are times when written methods are applied, it will depend on the circumstances.

Free Y6 maths worksheets: Mentally add 3-digit numbers (pg 1)

Free Y6 maths worksheets: Mentally add 3-digit numbers (pg 2)

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