Countdown

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Target

2470

4

5

8

14

19

Use each of the numbers only once with any mathematical operations to make an expression equal to the target.

If you can't make the target exactly, how close can you get to it?

Countdown

A Mathematics Lesson Starter Of The Day


Topics: Starter | Arithmetic | Fun

  • Chris Southward, Limehouse School
  •  
  • "Kris Faulder of Limehouse School came up with 19*8 + 5*17."
  • Amal, Islamia Girls Secondary School, London
  •  
  • "This was really easy
    18(9 + 9)(18 - 9) = 2916."
  • Harrison, Cloudside
  •  
  • "I got exactly the target with 2x6x8x10x12."
  • Transum,
  •  
  • "Just like yesterday's starter, this activity is based on a television programme popular in the UK. Sixty nine series have been broadcast since its debut on 2nd November 1982. With over 5,000 episodes, Countdown is one of the longest-running game shows in the world, along with the original French version, Des chiffres et des lettres, which has been running on French television continuously since 1965. [Source Wikipedia]."

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This starter has scored a mean of 3.8 out of 5 based on 489 votes.


Previous Day | This starter is for 2 July | Next Day

 

Answers

19(5 + 8)(14 - 4) = 2470

How many different sulutions do you think there are?

What strategies did you use?

Did you use your head, paper or a calculator?

Or did you use all three?

Could a computer help solve this problem?

Would you improve if you practised solving problems like this?

How could a group of students efficiently work together on a problem like his?

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 Laptops in Lessons or iPads?

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

Laptops In Lessons

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

Transum.org/go/?Start=July2

Here is the URL which will take them to a related student activity.

Transum.org/go/?to=Expression

Student Activity

 


Also available is the previous, Flash Version of this activity.

Apple

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