Multiply, Add, Subtract and Divide

This is a difficult Starter so there is a prize if you can complete it. The prize fund currently stands at 14 pounds.

For each pair of numbers subtract the sum from the product then divide the result by 20 without using a calculator.

5, 4
10, 9
13, 12
10, 13
10, 14
18, 11
10.5, 18
11.5, 11.5

No Calculator No Calculator No Calculator

Sorry

Sorry

At least one of your answers is wrong.

Congratulations

14 pounds = 1 stone.

You have won a stone!

Stone

There are plenty of stones around, take your pick.

A Mathematics Lesson Starter Of The Day

A Starter which is similar to this one but slightly easier is Multiply Sum by Difference then Divide.


Topics: Starter | Mental Methods

  • Louise, Brixham
  •  
  • The 14 pounds was a great motivator - after the lesson I discovered 14 pounds is a stone hahaha. I shall use this motivation again although obviously it will only work once with each group
    A good starter to get the kids working through all 4 rules of number
  • Tony Leach, Rickmansworth
  •  
  • Good challenge, and I am looking forward to receiving a heavy parcel soon!
  • Tom Lashland, Australia
  •  
  • Well, that was a surprise! I was thinking I could get easy cash but...
    I got a stone.
  • P McGinn, Kent
  •  
  • The "prize" joke at the end did not go down at all well ... for a difficult starter (that can take some time) seeing a joke when promised something else can take the wind out of the sails...
  • K. Wyman, Dorcehster Primary
  •  
  • The "prize" didn't go down well, especially as some children had worked really hard to solve each question.
  • Mr M, London
  •  
  • This was a very good starter, my class were very motivated and even calculated how much money they would each get. At the end when the stone came up they felt very disappointed but pleased with what they had achieved as a class.
  • Mr P, London
  •  
  • The class loved this one. They couldn't contain themselves when they realised they had been fooled!

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.

Previous Day | This starter is for 27 June | Next Day

 

Answers

0.55 3.55 6.55 5.35
5.8 8.45 8.025 5.4625

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.


 

Dividing by twenty is a lot to ask,

But an easier method will help you.

Dividing by ten is a much easier task,

Then divide your answer by two!

 

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 link. As an Amazon Associate I earn a small amount from qualifying purchases which helps pay for the upkeep of this website.

Educational Technology on Amazon

 

GCSE Revision and Practice

Whatever exam board you use for GCSE Mathematics, this book by David Rayner remains an all-round winner. With this latest edition presented in full colour and completely updated for the new GCSE(9-1) specifications, this uniquely effective text continues to increase your chance of obtaining a good grade.

This book is targeted at the Higher tier GCSE, and provides a wealth of practice with careful progression, alongside substantial revision support for the new-style grading and exam questions. With all the new topics included, and a dedicated section on using and applying mathematics, this unique resource can be used either as a course book over two or three years or as a revision text in the run-up to exams. more...

Maths T-Shirts

Maths T-shirts on Amazon
Maths T-Shirts on Amazon

Online Maths Shop

Laptops In Lessons

Teacher, do your students have access to computers such as tablets, iPads or Laptops?  This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments:

Transum.org/go/?Start=June27

However it would be better to assign one of the student interactive activities below.

Laptops In Lessons

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

Transum.org/go/?to=Masad

Student Activity

 

Curriculum Reference

See the National Curriculum page for links to related online activities and resources.


Apple

©1997-2022 WWW.TRANSUM.ORG