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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Keywords: Starter | Arithmetic

"76 +4 = 80
80/ 4 = 20
20 / 4 = 5
5 - 4 = 1"

Sue Sunn, St Albans
Thursday, March 15, 2007

 

"Divided by 2 is a good starting point for foundation groups."

Francisco Schreiber, Rokeby School East London
Thursday, March 15, 2007

 

"This starter was a good one, the children loved it."

Miss Sidebotham, -
Saturday, March 15, 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"

Zara, Belmont Academy
Wednesday, March 19, 2008

 

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This starter has scored a mean of 3.6 out of 5 based on 28 votes.
 

  

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Try other key numbers

 

17 - 5 = 12

- 5 = 7

- 5 = 2

x 5 = 10

- 5 = 5

÷ 5 = 1