STAGE 2

Pick up a second very easy way to subtract a single digit.
It's ridiculously easy.

Then use both shortcuts to do long subtraction.
Don't subtract right to left. That's boring.
Do it left to right.
Or maybe concertina fashion...

You can subtract any which way you like!
And because you are using two powerful subtraction shortcuts
long subtraction becomes easy!


 
       
       
 


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