Free maths worksheet from mathsblog.co.uk
Here is another worksheet for subtraction; this time subtracting 9 from 2-digit numbers.
The usual method to do this in your head is to take 10 and then add 1.
So 56 – 9 is done in two steps:
56 – 10 = 46
46 + 1 = 47
56 – 9 = 47