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My mum made me do kumon for a while when I was a kid.

Not exactly sure if it's because of kumon, but I know the value of number combinations eg 5+8 I know is 13, so something like 45+78=40+70+13

Also I still know the times table off by heart (mum forced me to learn that as well) so I can calculate most things in my head, something I was surprised to learn most people can't do.

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I can only recall certain number combinations and I never bothered to do the drills to learn my multiplication tables. I can multiply very basic things (fives, tens, elevens) but aside from that I gotta use a calculator.

Takes me awhile to calculate things in my head and i'm often off by around 5-9 from the actual answer when I do work it out.

I know a bunch of methods of solving things though so if I have a calculator handy I can calculate the stuff I want but mental arithmetics was never something I valued as a kid.

I actually have a bit of trouble recalling the numbers sometimes, so I tend to rely on what feels right. Like numbers up to a certain point (eg 1-44, 2^(0 to 12)) all feel different to me and some numbers feel related (eg 5,9,45).

I have a bunch of methods too though they aren't very good compared to the ones I've seen other people use.

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