Well you should memorize those anyway. It’s useful all your life for easy calculation. If you want 7 items and they cost $3.50 each, it’s between $21 and $28.
I calculated it in my head without memorising all the multiplication tables. I just realised that 7*3.5 is equal to (7*5+7*2)/2. And that 49/2 is equal to 40/2+9/2. Easy peasy. This is why I failed second grade math, because multiplication tables are only useful for doing operations a few seconds faster.
Well you should memorize those anyway. It’s useful all your life for easy calculation. If you want 7 items and they cost $3.50 each, it’s between $21 and $28.
I check on the calculator I have with me at all times. It’s $24.50
I calculated it in my head without memorising all the multiplication tables. I just realised that 7*3.5 is equal to (7*5+7*2)/2. And that 49/2 is equal to 40/2+9/2. Easy peasy. This is why I failed second grade math, because multiplication tables are only useful for doing operations a few seconds faster.
Yeah but that doesn’t work when you need it most on “The Price is Right”.