3/1 * 4/2 * 5/3 * 6/4 * 7/5 ... ... 27/25 * 28/26 * 29/ 27 = 1/2 * 28 * 29 ( by cancelling out the common numerators and denominators) .. Equal 406?
6 years ago
Kwok Wai Keong
Correct!
6 years ago
Joanne Sam
Hi, Keng Kor, thank you very much for your help. Yes, the answer given is 406.
6 years ago
Hong Keng Kor
No prob.
6 years ago
Joanne Sam
Asked 9 years ago
SG
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Primary 5
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Geometry
Please help. Thanks in advance!
Replies
11
Gangadhara Gs
50cm2
6 years ago
Eugene Ng Ming Teck
I think Gangadhara Gs is right. Interesting question kept me thinking all night.
6 years ago
Joanne Sam
Can I ask how to arrive at 50cm2? The ans given is 44 4/9.
6 years ago
Shing Woei Peh
6 years ago
Joanne Sam
Hi Shing Woei Peh, thank you very much for the explanation.
6 years ago
Eugene Ng Ming Teck
Thanks Shing! Really cleared up my thoughts too. Guess pen and paper still best. I was over thinking it
6 years ago
Gangadhara Gs
How u say its 4/9
6 years ago
Eugene Ng Ming Teck
Ganga the same triangle can be divided in 9 smaller equal triangles. And the shaded square would take 4 out of the 9 smaller triangles.
I had a similar misconception as you in thinking that the shaded square would still be the same area when in A as in B.
6 years ago
Boey Wai Yen
Thanks for the answer. Good challenging question for the kids!