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 others. This, of course, is very similar to counting from one to ten, but don’t say that a nought has been added: much better to say the units digit has moved one place to the left and a nought has been placed in the units.
Follow the dogs leads to complete the number lines in whole tens up to 90.