Here we have some great pages for practising subtracting multiples of 10. Children who have learnt their addition of single digit facts should find these straightforward. It is interesting to ask ourselves how we actually go about answering questions such as these in our heads. Some we just seem to know eg 40 - 30. Others require a quick mental calculation. For 60 - 30 I count up in tens from 30 to 60 in my head at an incredible speed that I hardly realise that is what I am doing. For 80 - 20 I take 2 from 8, which I know is 6, and then make the answer 10 times bigger. Or do I? I think that I might well take either of these approaches at different times. The main point is that I can answer them in less than one second each and as children gain confidence they should also be able to answer very quickly. For now, however, they are probably still counting on fingers or out loud. Do discuss with your children how they do these and how you do them. Go to our Subtract multiples of ten resources