Check out this set of counting worksheets which helps kids practice counting to the numbers 10, 20, 25, 50 and 100.
Curriculum Snippet- ELG 11
The aims for Year R:
Children count reliably with numbers from 1 to 20, place them in
order and say which number is one more or one less than a given
number. Using quantities and objects, they add and subtract two
single-digit numbers and count on or back to find the answer.
They solve problems, including doubling, halving and sharing.*
* This text is taken directly from the 2014 English National Curriculum