re: 9+6 = ? "Our young learners might not be altogether comfortable..."

quote:

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678 plus 517. In your head.























Okay now 680 plus 515.

Easier ain't it?

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put that down on paper and do it

(678
+517

it is difficult to do this on the computer so I will explain how it is done by explaining exactly what I did

line up single digits double digits and triple digits.

add single digits

8+7=15
put down 5 carry the 1
1+7+1= 9
put down the 9 in front of the 5
6+5 = 11
put down 11 in front of 9 and 5
you get 1195

now the new math way.

678
517

round up to 680.
subtract 2 to 517 = 515
now round up to 700
subtract 20 from 515 = 495

now round 700 up to 1000
subtract 300 from 495= 300
now add 115 to to 1000 = 1115

That is a lot more complicated on a piece of paper. If we are dealing with powers of 10, than you can't add 680 to 515 or 495 to 700 because a 4th grader according to common core won't understand that Math.

Sure this helps you deal with things in your head, but why would you want to do triple digit addition equations in your head? In the real world when would you do that, when you could get out your phone or a piece of paper and add it up in a few seconds.

Common core math is stupid and more complicated than so called complicated math problems.