Here is the very latest in our Superbrains section for children who are comfortable with addition of single digits and are ready to work with larger numbers. There are four great, colourful worksheets on completing number sentences with answers up to 20.
There is a number line to 20 displayed on each page to help with counting on.
Some of the questions are trickier as they ask which number is needed to be added to make the given total. The easiest way to do this is by subtracting or counting down. Once again this shows the relationship between addition and subtraction.