Think Back

A Maths Starter Of The Day

Luis thinks of a number.

He then does the following operations:

Multiply by 3, subtract 2, multiply by 2 then add 40 (in that order).

No calculators allowed

He finds that the number he ends up with is 12 times his original number.

What was Luis's original number?


A Mathematics Lesson Starter Of The Day

Change NumbersEasier Questions


Topics: Starter | Algebra

  • Teacher, Derbyshire
  • Used this as a plenary question to a year 8 lesson on solving equations with x on both sides. Good challenge both in setting up the equation and then solving it.
  • Teacher, Surrey
  • When checking answer, it only works on non-scientific calculators as they do not apply BIDMAS!!
  • Mr J, Balshaws
  • We found this starter very interesting. Harry really loved it!!!

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This starter has scored a mean of 2.4 out of 5 based on 318 votes.

Previous Day | This starter is for 11 April | Next Day


Too difficult? There are some simpler questions like this on the THOAN Starter page.


Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.

Laptops In Lessons

Teacher, do your students have access to computers?
Do they have iPads or Laptops in Lessons?

Whether your students each have a TabletPC, a Surface or a Mac, this activity lends itself to eLearning (Engaged Learning).

Laptops In Lessons

Here a concise URL for a version of this page without the comments.

Here is the URL which will take them to the Think Of A Number exercise.

Student Activity

Here is the URL which will you to our eQuation Generator which provides unlimited practice solving linear equations.

Student Activity



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