One Digit 100

How many ways can you write an expression for 100 which only uses the same digit repeated and any operations?

One Digit 100

Share

Topics: Starter | Arithmetic | Place Value | Problem Solving | Puzzles

  • Miss Llewellyn’s set one, Rawthorpe
  •  
  • (5x5)=25 25-5=20 20x5=100 so (5x5-5)x5
  • OpenGate , Czech Republic
  •  
  • Generally: (AAA-AA)/A, you can choose any number between 1-9 instead of A
  • Hannah Loyden (10-3), St John Bosco Liverpool
  •  
  • Suggestion is 55 + 55 - 5 - 5 = 100.
  • 10-3, WHGS Manchester
  •  
  • Denny(11 x 11) - 11 - 11 + 1 = 100
    Musa (ish) 1 + 1 + 1 etc = 100
    Sammi 55 + 55 - 5 - 5
    Dom 22 x 22 -222 - 222 + 22 + 22 + 22 - 2 - 2 - 2.
  • Hethersett Junior School, Hethersett Junior School
  •  
  • 5(5 + 5 + 5 + 5)
    55 + 55 - 5 - 5
    2(22 x 2) + 2 + 2 + 2 + 2 + 2 + 2.
  • Jacob, St John Baptist
  •  
  • Another one is 888-88=800*8=100.
  • Saleem Shah, Furness Primary School
  •  
  • My name is Saleem and i've got 4 solutions
    (5×5)+(5×5)+(5+5)+(5+5)=100
    55+(5×5)+5+5+5+5=100
    (2+2+2+2+2)×22÷2-(2+2+2+2+2)=100
    11×11-11÷(1+1+1+1+1+1+1+1+1+1)=100.
  • Faiz, Hethersett JUnior
  •  
  • (2x2) x 22 +(2x2) + (2x2) + (2x2).
  • Michael, Hethersett Junior
  •  
  • 44 + 44 +(44/4) + 44/44.
  • RIO+ MICHAEL, ROOM 10
  •  
  • 5x5x5-5-5-5-5-5.
  • St Peter's Y6 Maths, UK
  •  
  • We loved this and got loads of good answers - Abi T was our winner.

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 3.1 out of 5 based on 303 votes.


Previous Day | This starter is for 4 October | Next Day

 

Answers

In addition to the examples you can find other solutions in the comments above.

One Digit 100


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=October4

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

Transum.org/go/?to=OneDigit

Student Activity

 


Apple

©1997-2017 WWW.TRANSUM.ORG