1. Progression in written methods for subtraction
NNS recommendations

2. Stage 1: counting up from the smaller to the larger number
I can find Watch!
= 84. So 84 – 56 = 28.

3. Stage 2: compensation Here we take too much then add back.
is the same as 84 – which is = 28!

4. I understand how this method works!
Stage 3: use of the expanded subtraction algorithm (no decomposition required)
This stage is the beginning of the standard algorithm but in a much expanded format. As no decomposition is required, the calculation can be done left to right.
I understand how this method works!
563 – 241 =
So 563 – 241 = 322

5. Stage 4: use of the expanded subtraction algorithm (decomposition required)
566 – 278 = = =
= 288
This is a bit more difficult. I have to exchange 1 hundred for 10 tens and 1 ten for 10 units!

6. Stage 5: standard method
The standard contracted algorithm is used using decomposition where necessary.
I understand how to use this method because really it is the same as the last method we used!
566 – 278 = 51616
2 8 8