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Target

241

2

2

5

13

17

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?

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A Mathematics Lesson Starter Of The Day


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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
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  • 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.
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  • 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.
  • East End Primary, Twitter
  •  

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This starter has scored a mean of 3.3 out of 5 based on 425 votes.


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

 

Answers

2 x 2 x 5 + 13 x 17 = 241

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.



Christmas Present Ideas

It is often very difficult choosing Christmas presents for family and friends but so here are some seasonal, mathematics-related gifts chosen and recommended by Transum Mathematics.

Equate board game

Here's a great board game that will give any family with school-aged kids hours of worthwhile fun. Christmas is a time for board games but this one will still be useful at any time of year. Games can be adapted to suit many levels of Mathematical ability.

For Maths tutors working with just one or small groups of pupils this game has proved to be an excellent activity for a tutorial. Deciding on the best moves can spark pertinent discussions about mathematical concepts.

Equate looks a bit like Scrabble--for aspiring mathematicians, that is. Designed by a real mathematician, it works like this: You put down tiles on a board and make points by correctly completing simple equations. Your nine tiles include both numbers and mathematical symbols; you can add on to previous plays both vertically and horizontally. more...

How Not To Be Wrong

The maths we learn in school can seem like an abstract set of rules, laid down by the ancients and not to be questioned. In fact, Jordan Ellenberg shows us, maths touches on everything we do, and a little mathematical knowledge reveals the hidden structures that lie beneath the world's messy and chaotic surface. In How Not to be Wrong, Ellenberg explores the mathematician's method of analyzing life, from the everyday to the cosmic, showing us which numbers to defend, which ones to ignore, and when to change the equation entirely. Along the way, he explains calculus in a single page, describes Gödel's theorem using only one-syllable words, and reveals how early you actually need to get to the airport.

What more could the inquisitive adult want for Christmas? This book makes a cosy, interesting read in front of the fire on those cold winter evenings. more...

Graphic Display Calculator

This handheld device and companion software are designed to generate opportunities for classroom exploration and to promote greater understanding of core concepts in the mathematics and science classroom. TI-Nspire technology has been developed through sound classroom research which shows that "linked multiple representation are crucial in development of conceptual understanding and it is feasible only through use of a technology such as TI-Nspire, which provides simultaneous, dynamically linked representations of graphs, equations, data, and verbal explanations, such that a change in one representation is immediately reflected in the others.

For the young people in your life it is a great investment. Bought as a Christmas present but useful for many years to come as the young person turns into an A-level candidate then works their way through university. more...

iPad Air

The analytics show that more and more people are accessing Transum Mathematics via an iPad as it is so portable and responsive. The iPad has so many other uses in addition to solving Transum's puzzles and challenges and it would make an excellent Christmas gift for anyone.

You have to hold iPad Air to believe it. It’s just 7.5 millimeters thin and weighs just one pound. The stunning Retina display sits inside thinner bezels, so all you see is your content. And an incredible amount of power lies inside the sleek enclosure. So you can do so much more. With so much less. more...

Before giving an iPad as a Christmas gift you could add a link to iPad Maths to the home screen.

Aristotle's Number Puzzle

It’s a bit of a tradition to give puzzles as Christmas Gifts to nieces and nephews. This puzzle is ideal for the keen puzzle solver who would like a challenge that will continue over the festive period (at least!).

This number puzzle involves nineteen numbers arranged into a hexagon. The goal of the puzzle is to rearrange the numbers so each of the fifteen rows add up to 38. It comes in a wooden style with an antique, aged look.

Keep the Maths in Christmaths with this reasonably priced stocking filler. more...

Click the images above to see all the details of these gift ideas and to buy them online.


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.

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

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Student Activity

 


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