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I don't have a visual representation for numbers, but numbers with a 9 at then end like say 29 in my mind is always transformed in to 30-1 , so instinctively (n
by simion314 5y ago
I don't have a visual representation for numbers, but numbers with a 9 at then end like say 29 in my mind is always transformed in to 30-1 , so instinctively (nobody teaches me this) computations like 29 + 15 = (30 -1) + 15 = 30 +15 -1 =45-1. This makes it more easy for multiplications 2915= 3015 - 15 . I could apply this for numbers ending with 7 or 8 but it does not fill natural for me as 9.
- deltaonefour 5y agoOh that's a symbolic reflex. totally normal, I have shortcuts in my brain like that too. But the Article describes a visual entity... a block with a dent (the number 9) then the dent orange peeling another number until it's smaller.