More addition by adjusting

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

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

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

Look at the addition number sentence. What could the two missing numbers be?

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

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