Last week in school we were going over 1 more and 1 less to 20. Most of the children were able to do this although 1 less from 10 to 20 was the part that they found the most difficult. Please practise counting backwards from 20 to 10 to help with this. This can be done with a numberline initially then without. The worksheet will reinforce this. If your child can confidently do this then they could do the extension worksheet instead.
The next worksheets are subtraction to 8, 15 or 20 linked to one less and counting backwards. Please chose the most appropriate worksheets for your child, they don't need to do all of them.