I was in school way before the new math thing. I figured out doing it all in my head like this on my own because i hated writing out and solving math problems. Especially long division, and was able to coast through all my math classes. It felt pretty natural, which is how I think they decided to start doing “new math”.
I was in school way before the new math thing. I figured out doing it all in my head like this on my own because i hated writing out and solving math problems. Especially long division, and was able to coast through all my math classes. It felt pretty natural, which is how I think they decided to start doing “new math”.
9 X 47= ?
No problem.
10 X 47 is 470. Need 47 less than that.
70 minus 40 is 30.
30 minus 7 is 23.
9 X 47 = 423.