The purpose of this activity is to work out a hidden number on a calculator using knowledge of number sequence.
Specific Learning Outcomes
use their knowledge of decimal number sequence order decimals.
Required Resource Materials
One calculator per person.
- Students enter a number into their calculator and push the division sign once. The student keeps pressing the equals sign until 0 is shown (depending on the ability of the student you could allow a one, two, three, or four decimal place number).
- The student then hands over their calculator to a partner. It is important that no other button is pressed on the calculator as it is handed over.
- The partner puts in a number and presses =. Again it is imperative that no other number is pressed as this will wipe the memory on the calculator.
- The number displayed on the calculator screen will tell the partner how close they are to the number entered. A number larger than 1 means the number they entered is bigger than the mystery number and a number less than 1 means the number is smaller than the mystery number.
- The partner can keep trying numbers, thinking about whether they need a smaller or larger number each time.
- The challenge is to get 1 displayed on the screen in as few guesses as possible. Once the partner has a 1 displayed on the screen they have guessed the mystery number.