Year 1 - Subtraction counting back
Year 3 - Subtraction by Counting On
Year 4 - Subtraction by Counting Back
Year 4 - Subtraction by Counting Up
Year 5 - Round and adjust
Year 5 - Counting up
The written 'Frog' method is shown first so that you can see how it then transfers to a mental method.
Year 6 - Near Multiples of Powers of 10
Year 6 - Using Place Value
Year 3 - Counting up using a number line
This method can lead to a mental method once the child can do it in their head.