More addition practice

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

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

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

Several ways to investigate the relationship between addition and subtraction.

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

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