Only One Number

A Maths Starter of The Day

68 can be changed to 1 by using only the number 4 key, together with any of the operation keys. For example,

- 4 = 64
÷ 4 = 16
÷ 4 = 4
÷ 4 = 1
 

Find other numbers that can be changed to 1 using only the 4 key and any operation.

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  • Sue Sunn, St Albans
  • Thursday, March 15, 2007
  • "76 +4 = 80
    80/ 4 = 20
    20 / 4 = 5
    5 - 4 = 1"
  • Francisco Schreiber, Rokeby School East London
  • Thursday, March 15, 2007
  • "Divided by 2 is a good starting point for foundation groups."
  • Miss Sidebotham, -
  • Saturday, March 15, 2008
  • "This starter was a good one, the children loved it."
  • Zara, Belmont Academy
  • Wednesday, March 19, 2008
  • "Really good. Got my brain thinking...
    How about... 96
    96/4=24
    24-4=20
    20-4=16
    16/4=4
    4/4=1"
  • Jordan, Admirals Junior School
  • Wednesday, March 25, 2009
  • "Sixty eight plus four plus four plus four plus four plus four plus four plus four plus four divided by four take away four take away four take away four take away four equals ONE!"
  • Amal, Colville School, In London ,West London
  • Wednesday, December 02, 2009
  • "Ther are many the trick is +4 -4 and dived by four and times by four."

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This starter has scored a mean of 3.0 out of 5 based on 21 votes.
 

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Try other key numbers

 

17 - 5 = 12

- 5 = 7

- 5 = 2

x 5 = 10

- 5 = 5

÷ 5 = 1