Add 9 or 11 by adjusting

Adding 9 or 11 to 3-digit numbers by adding 10 and adjusting.

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Use the technique for adding 9 for adding 19, 29, 39 etc. This makes hard looking calculations quite easy.

For those children who need a little extra practice at addition using mental techniques learnt earlier.

Try these addition of three, single digit numbers. Remember to look for pairs that make 10.

Look for pairs of numbers that make 20 in these addition questions.

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