Addition number sentences

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

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

Two helpful tips on these pages: skills that are essential for fast mental calculating.

Several ways to investigate the relationship between addition and subtraction.

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