Posted by Peter on 2nd May 2013

Resource of the week: adding 2-digit numbers mentally

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One of the keys to success with maths is being able to calculate mentally. There should be no need to resort to written methods or to a calculator to add two 2-digit numbers; mental calculations should rule!

Having said that, these are not easy, and a number of skills need to have been learned to do these in an efficient manner.

For example: looking at ‘add 46 to 67′.

There a a number of ways to do this. Perhaps the most efficient is to add 40 to 67 to make 107 and then add on the extra 6 to make 113.
The second part of the sheet is a reminder of some of the ways that addition questions can be phrased.

Free Y4 maths worksheet: More addition in your head (pg 2)

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