Mathematical Genius..... NOT.

[Squid]

Ha! if you think that's bad, try Thailand
I worked in Asia for eight years and once bought ten fasteners at 10 Baht each from a small shop. I was bemused to see the cashier get out the calculator, presumably to multiply ten by ten.
I overestimated her. The actual calculation done was 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10. I'm not making this up. I so wanted her to mis-key and charge me 90 Baht.
Yes, and I too grew up doing, in primary school, stuff like a shopper buys five apples at 7d each, how much change from a ten bob note? Then divide £122 7s & 8d between seven people, giving your answer to the nearest grain. Or something like that.

But did your "lady" friend steal your mobile and wallet?

 

[static zap]

Tuppence, Ha'pence Threepence, sixpence, that was the old way to call it pence even though in accounting it was d. for denares/denarius

Was always the L s d ..bit that caught my eye , but I'm no politician!