The next in our rapidly developing series of addition worksheets for children who are getting more confident with mental arithmetic and can handle 2-digit numbers. These pages look at adding a 2-digit number to a multiple of 10, again all answers keep to below 100. This is also good reinforcement of place value. Watch out [...]

This is a favourite with me as it is such an easy little trick to remember, which also makes addition easier. When I was thinking about how I do calculations in my head I realised that if I had to add nine I usually took two steps. Firstly, I added ten and secondly, I took [...]