Mrs Brown, a past SIJS teacher, requested the help of our year 3 mathematicians for her new school! She needed help in explaining the wide range of mental strategies that can be used, depending on the calculation. Finding the most effective strategy is key to getting to the correct answer in the quickest time possible. Some facts we ‘just know’ after years of practising with actual objects and playing with numbers, such as number bonds and doubles. Also, for some calculations, we apply the knowledge of known facts to help us get to the answer e.g. near doubles. Sometimes, we can visualise the number square to support us, e.g. moving down the columns on a 100 square when you add multiples of 10 and some people prefer visualising a number line, especially for the calculations that you bridge through 10 (count beyond 10) .
We hope that these short movies, filmed by our SIJS mathematicians on our new iPads, will add clarity to Mrs Brown’s children in Stoke!