Countdown

?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
Target

56

4

8

7

11

15

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


Share

Topics: Starter | Arithmetic | Mental Methods

  • Mike Moon, Royds School Leeds
  •  
  • "I got 173 from 8 x 11 + 5 x 16 + 5"
  • Hardip Sahota, Ernesford Grange, Coventry
  •  
  • "I did 15 x 14 = 210 then subtract 3 = 207"
  • The Best Class Ever (8cd/m2), King Alfred's College OXON
  •  
  • "This starter was a nice one to start with for our class. We had two attempts at this one, because somebody shouted out the first answer within 2 seconds(James!!!!!!!!!)
    The sums we had were 49 (which was easy) and 262 (which took longer to do).
    It was a good starter."
  • Chloe Tovell,
  •  
  • "I got 226 (one out) by
    8x7=56 then
    16+18x5=170 finally
    56+170=226.
    i really liked this starter of the day and would like to see more like this!"
  • Ember, Huddersfield
  •  
  • "I had 1008. Numnbers were 1 4 1 18 14. Gives good practice on estimation.20 x 10 x 4 is 1000 take it from there. Finally got there with 18 x 14 x 4 + 1 - 1. It was the last bit that was perplexing. 'Can you do that? questions."
  • 9-5 King's Grove, Crewe
  •  
  • "We found this easier to work backwards. We took the 2 away to work with 390 and when from there. 17+8 = 25 +1 = 26 x 15 = 390 +2 = 392."
  • Jericho And Suheera, East Sheen Primary
  •  
  • "Answer for 336
    16x18=288
    3x8 = 24
    24 x 2 = 48
    288 + 48 = 336."
  • STEVE EASTOP, MARGATE, KENT.
  •  
  • "TARGET: 1573
    NUMBER SELECTION: 2,4,7,13,13
    SOLUTION:
    (13-2) X (7+4) X (13) = 11 X 11 X 13 = 1573!
    I happened to notice at the start that the target figure was indeed divisible by 13 (121 times). It was easy then to get the two 11s needed from the remaining four numbers to multiply by one another to get the 121 necessary to then multiply the other 13 in the five numbers by to get the target!"
  • Miss Pocula, All Saints Academy Plymouth
  •  
  • "Target 1890 with 1, 7, 8, 10 & 14
    (14+7) x (8+9) x 10
    From Harry Shock 9A1."
  • Jackie, Leicestershire
  •  
  • "I got the number 52224 with a lot of trial and improvement. the numbers were 4 8 8 17 and 12. I did 4 times 8 times 8 times 17 times 12 and it worked, this starter was amazing but tricky."

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
Click here to enter your comments.

If you don't have the time to provide feedback we'd really appreciate it if you could give this page a score! We are constantly improving and adding to these starters so it would be really helpful to know which ones are most useful. Simply click on a button below:

Excellent, I would like to see more like this
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.

This starter has scored a mean of 3.6 out of 5 based on 226 votes.


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

 

Answers

(11 - 4) x (15 - 8) + 7 = 56

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=November2

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

©1997-2016 WWW.TRANSUM.ORG