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Priceless photograph by Ms Elaine Ho.
Found the following question on the net:
There is this number which is less than 100.
1) Divide by 3 get remainder 1
2) Divide by 4 get remainder 2
3) Divide by 5 get remainder 3
4) Divide by 6 get remainder 4
What is this number?
There are several methods to solve this problem. The person who can produce the most elegant solution and present it in class wins a prize. Get cracking! 
The speaker recommended to her audience to use Singapore textbooks at the end of the video!
Click here.
click here.
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