Making Maths Count
Maths Week Scotland 2019 – Broken Calculator
Problem 1: Broken Calculator
Doing calculations on an old and broken basic calculator is very tricky. The problem with this calculator is that it has only five (white) buttons still working. They are the 3 and the 9, the buttons for adding and dividing and the equals button. (The red buttons don’t work at all.)
Danny has done a calculation that led to the answer 40. We know that he made no more than eight button presses. Find three sequences of buttons that he could have pressed.
Solutions to Problem 1: