Maths Weekly Challenge!

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Here’s a maths trick to try!

  1. Think of one of the numbers from 1 to 9.
  2. Add 9 to your number.
  3. Add the digits of your answer together.

What is your new number?
What do you notice?

Try the trick again with a new starting number.
What do you notice now?

Can you explain what is happening and why?

Post your answers and explanations of the maths trick in the comments section below!

2 comments on “Maths Weekly Challenge!

  1. I notice that the number you start with is also the number you end with!
    It works when you add 9 to a number and the unit is one less. The ten is one more so that when you add the tens and the ones together they make the number that you added nine to. Love Daniel.

  2. Fantastic work Daniel!
    You explained this very well!

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