Jamie Lee
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Fractions

Hi any teachers can help to solve qns 10, 11 and 12. Please help me sister. thx

Replies 4
Yueh Mei Liu

5 years ago
Yueh Mei Liu

5 years ago
Yueh Mei Liu

5 years ago
Jamie Lee

thank u

5 years ago

Hong Keng Kor
Asked 9 years ago

SG chevron_right Primary 6 chevron_right Number and Algebra

Interesting qn

Replies 4
Boey Wai Yen

Solution & proof that I managed to find - you start by using 1 domino to cover 2 squares, and you will notice that the 2 squares covered are always 1 black, 1 white. Therefore 32 dominoes cover 32 black & 32 white squares. But if you remove the corners, u notice that 2 white squares are removed, leaving 32 black & 30 white. Hence, no matter how u try, no way to place 31 dominoes on the chessboard. However, if u remove 1 black square & 1 white square on the board, regardless their locations, then yes, you can cover the board with 31 dominoes (Gomory's theorem) Thanks for helping me learn something new today. 😀

5 years ago
Hong Keng Kor

Super detailed explanation by Boey Wai Yen 👍

5 years ago
Boey Wai Yen

Thank you! ☺️

5 years ago
Shyanne Sim

It's impossible to do it

5 years ago

Linda Lau
Asked 9 years ago

SG chevron_right chevron_right

Thanks for adding!!

Replies 0

Michelle Looi
Asked 9 years ago

SG chevron_right chevron_right

Thank you for accepting

Replies 0

Marian Goh
Asked 9 years ago

SG chevron_right chevron_right

Thanks yueh Mei for the add 😊

Replies 0

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