But I Need To Multiply Them!
Logic
Level
1
\[ \begin{array}{ccccc} & & & 1 & 2&3\\ \times & & & & 4 &5\\ \hline & & \bigstar & \bigstar & 3&5\\ \hline \end{array} \]
Find the value that represents the symbol \(\bigstar \).
Can you do it without multiplying the expression?
by
Pi Han Goh