Multiplication magic square
Weekly Problem 32 - 2015
Can you work out the missing numbers in this multiplication magic square?
Can you work out the missing numbers in this multiplication magic square?
Problem
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In this Multiplication Magic Square, the product of the three numbers in each row, column and diagonal is $1$.
What is the value of $r+s$?
If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.
Student Solutions
Answer: $\frac9{16}$
One way to find it:
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Therefore $r+s=\frac{1}{2}+\frac{1}{16}=\frac{9}{16}$