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Mental Arithmetic

Posted by on Mar. 23, 2014 at 5:55 AM
• 36 Replies

Time how long it takes you to get an answer to the following subtraction problem, in your head.   No writing stuff down, or using a calculator.

427 - 316 =

(A) What number did you get as the answer?

(B) How long did it take you?

(C) How did you get it?

So, for example, you might reply:

(A) 42

(B) 10 seconds

(C) I counted onwards in 10s, then in 1s.

by on Mar. 23, 2014 at 5:55 AM
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Replies (1-10):
by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:55 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:56 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:56 AM

BUMP!

by Platinum Member on Mar. 23, 2014 at 5:56 AM

BUMP!