Activity · Year 6

Mission down to 1

Start with 999 on a calculator and use the digits 1 to 9 once each to bring the total down as close to 1 as you can.

  1. Enter the number 999 into your calculator

    Mission down to 1 – picture 1

  2. Now, you can use any function (add, subtract, multiply or divide) and any of the numbers:

  3. 1,2,3,4,5,6,7,8,9

    (but you can only use a number once).

    The idea is to reduce 999 down to 1.

    Can you get close to the number 1?

  4. What strategies did you use?

    Try a few more times…

    What if you start with the 9,999 or 999,999