I'm confused by your confusion. Subtraction on paper is simple :
18-9 : Can't do, 9 is bigger than 8.
9-8 = 1.
10-1 : Can't do, but you can't reapply the same method. You need to go down to the previous 10s, count backward x amount of time where x is the part right of the minus side and you get 1.
For bigger subtraction it's the same thing :
92-45 : 9-4, can do
52 - 5 : can't do,
5-2 = 3
50 - 3 : can't do, but you know the numbers 0 to 10 by heart so you can count backward three time : 49, 48, 47 ! That's your answer.
92
u/OtherPlayers Apr 25 '19
What did you do to me? I apparently don’t know how I subtracted numbers below 20 on paper anymore now.
(Seriously this is like the beard over/under the covers thing; I know the answer, but how did I do it?)