>>35838734Choco, Fubuki(outside specific bits), and Sora.
>>35838934It's about mental visualization, like
>>35839048said. I'm with him on this one, it's easier to visualize 15x4 rather than 4x15.
>>35839158People often memorize a table of low-number results and use that to calculate without any reference to physical things. The ability to do that(and more importantly, compound on that) is what make people good at high-tier mathematics.
>>35839210That's an easy result you just memorized though. Our brains are incredibly bad at visualizing big numbers of anything, so someone going with "4 stacks of 15" rather than "fifteen stacks of four" makes sense.