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How do you make 55 using four four's?

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asmathwiz | Student | Honors

Posted February 16, 2012 at 6:40 AM via web

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How do you make 55 using four four's?

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embizze | High School Teacher | (Level 1) Educator Emeritus

Posted February 16, 2012 at 12:10 PM (Answer #1)

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Try `(4!)/(.4)-((sqrt(4))!)/(.4)`

`4! =4*3*2*1`

`.4=2/5`

`(sqrt(4))! = 2! =2*1`

So we have `(4!)/.4-((sqrt(4))!)/.4`

`=24/(2/5)-2/(2/5)`

`=60-5`

`=55`

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