Question 3
A $5\times7$ board is to be partitioned into $1\times1$, $2\times2$ and $3\times3$ sub-boards. What is the smallest number of $1\times1$ sub-boards? Sketch one possible diagram. (2 marks)
Now use an $11\times11$ board under the same conditions. What is the smallest number of $1\times1$ sub-boards? Sketch one possible diagram. (4 marks)
**Correct answers with incorrect drawings will be given 0 marks.**
Now use an $11\times11$ board under the same conditions. What is the smallest number of $1\times1$ sub-boards? Sketch one possible diagram. (4 marks)
**Correct answers with incorrect drawings will be given 0 marks.**