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###### Target

419

7

8

8

14

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?

## 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
•
• 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!
• Transum,
•
• Happy Birthday Countdown! 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].
• 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
•
• Williamston Primary, Twitter
•
• Mattocks Primary School, Primary 7
•
• 14 x 19 = 266
3 x 7 = 21
add them together = 287
Then x 287 by 1 = 287.

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.
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This starter has scored a mean of 3.2 out of 5 based on 581 votes.

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## Answers

7 x 8 x 8 - 14 - 15 = 419

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.

Your access to the majority of the Transum resources continues to be free but you can help support the continued growth of the website by doing your Amazon shopping using the links on this page. Below is an Amazon search box and some items chosen and recommended by Transum Mathematics to get you started.

## Have you read Craig's book yet?

Craig Barton must surely be the voice of Mathematics teachers in the UK. His wonderful podcasts interviewing the industry experts have culminated in this wonderful book. As Craig says: "I genuinely believe I have never taught mathematics better, and my students have never learned more. I just wish I had known all of this twelve years ago..." more...

"How I wish I'd taught Maths" is an extraordinary and important book. Part guide to research, part memoir, part survival handbook, it’s a wonderfully accessible guide to the latest research on teaching mathematics, presented in a disarmingly honest and readable way. I know of no other book that presents as much usable research evidence on the dos and don’ts of mathematics teaching in such a clear and practical way. No matter how long you have been doing it, if you teach mathematics—from primary school to university—this book is for you." Dylan Wiliam, Emeritus Professor of Educational Assessment, UCL.

## Casio Classwiz Calculator

There is currently a lot of talk about this new calculator being the best in its price range for use in the Maths classroom. The new ClassWiz features a high-resolution display making it easier to view numerical formulas and symbols but it isn't a graphical calculator as such (it has the capacity to draw graphs on your smart phone or tablet, via a scannable QR code and an app).

As well as basic spreadsheet mode and an equation solving feature you also get the ability to solve quadratic, cubic or quartic polynomial inequalities and the answer is given just as it should be written down, using the correct inequality symbols!

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

## Hello World

You are buying a (driverless) car. One vehicle is programmed to save as many lives as possible in a collision. Another promises to prioritize the lives of its passengers. Which do you choose?

Welcome to the age of the algorithm, the story of a not-too-distant future where machines rule supreme, making important decisions – in healthcare, transport, finance, security, what we watch, where we go even who we send to prison. So how much should we rely on them? What kind of future do we want?

Hannah Fry takes us on a tour of the good, the bad and the downright ugly of the algorithms that surround us. In Hello World she lifts the lid on their inner workings, demonstrates their power, exposes their limitations, and examines whether they really are an improvement on the humans they are replacing.

This calculator has a high-performance processor and twice the memory of previous models ensuring speedy operation and superior computational power.more...

 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).

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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