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How fast for multiplication?
Given 15 problems all involving the factor 9. How long should it take a fifth grader to complete these problems perfectly?
2 Answers
- 1 decade agoFavorite Answer
If your fifth grader can solve them correctly, without coaching, encouraging, coaxing or threatening. Does it really matter how long it takes?
If he/she MUST do them quickly, I myself personally prefer the trick of doing them on my fingers. Looking at the backs of your hands bend down your pinky on your left hand. 1 X 9 = 9. Now only bend the ring finger of the left hand. 2 X 9 = 18 (the one being the finger on the left of the ring finger, the 8 being the rest of the fingers) and so on until the end. In this manner, I would expect it would take 5 minutes or less to solve all 15.
In my humble opinion, speed is secondary to the process of being able to solve the problem.
From a chemical engineer who STILL does not know her multiplication tables by heart.
