[gundog]

We had to make those in elementary school. I don’t remember what the minimum was, but you could take it as far as you wanted. And if I see “169,” I think 13 squared. And doing 17x19=100+70+90+63 is second nature. The brain needs to be trained.

[ShadowAce]

And doing 17x19=100+70+90+63 is second nature.

340-17 is quicker.