When children are very confident with counting in ones and they have also worked with larger numbers in the teens, they can be introduced to counting up in whole tens. At first this will be up to 100. These four worksheets give plenty of practice at writing the whole tens that come before and after [...]

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 [...]