When I do mental arithmetic my brain frequently tokenizes into digit pairs or triples if I can recognize pairs and triples that have specific properties.
"224" is actually a really nice object to recognize because it's 7 * 32, and if you can recognize other multiples of 32 it frequently gives you shortcuts. It's less useful for addition because you would need to get lucky and get a multiple of 32 (or 7) on both sides, but for multiplication and division it helps a lot.
"224" is actually a really nice object to recognize because it's 7 * 32, and if you can recognize other multiples of 32 it frequently gives you shortcuts. It's less useful for addition because you would need to get lucky and get a multiple of 32 (or 7) on both sides, but for multiplication and division it helps a lot.