A much harder set of questions on these four worksheets. This time we are looking at taking away 19 from 2-digit numbers. Usually the easiest way to do this is to subtract 20 and then add one to the answer. If the number has a 9 in the units it is probably easier to just subtract the 19 in one go.
Traditionally it might have been expected to resort to written methods to do this but the new Primary Framwork for Maths is very keen on children been quick and able mentally before they start to work anything out on paper.