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.

3, 2
8, 7
14, 13
15, 16
17, 11
11, 16
19.5, 15
15.5, 15.5

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

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.


Share

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.

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 3.0 out of 5 based on 213 votes.


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

 

Answers

0.05 2.05 7.75 10.45
7.95 7.45 12.9 10.4625

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!

 

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...

Online Maths Shop

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.

Transum.org/go/?Start=June27

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

Transum.org/go/?to=Masad

 

 


Apple

©1997-2017 WWW.TRANSUM.ORG