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I just asked my stepdaughter "What is 33 minus 18?" "Because ... 18 plus 18 is 36 ..... it's 18 minus 3 ... 15!"
by jonsen 9y ago
I just asked my stepdaughter "What is 33 minus 18?"
"Because ... 18 plus 18 is 36 ..... it's 18 minus 3 ... 15!"
- bfung 9y agoIsn't it suppose to be: 18 to 20 is 2 20 to 30 is 10 30 to 33 is 3 2 + 10 + 3 = 15 ? Also, how does she know it's 18, plus an additional 18? Why not 18 + 20? What happens if it's 33 minus 21? 21 + 21 is 42... Just curious - but at least she's got her own system that works!
- jonsen 9y ago"If it's 33 minus 21, I'd probably do 3 minus 1 and 30 minus 20, because it's easy numbers."