My Math Forum Can anyone here factor 100 numbers and spot all primes in 20 MINUTES?

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 April 16th, 2017, 08:02 AM #1 Newbie   Joined: Jan 2013 Posts: 19 Thanks: 0 Can anyone here factor 100 numbers and spot all primes in 20 MINUTES? Can anyone here factor 100 numbers and spot all primes in 20 MINUITS?....Grade 4 students are currently doing it now I can show u the simple manual method...If u wish..If not that's cool
 April 16th, 2017, 09:18 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,037 Thanks: 1063 who cares Thanks from jonah, Posher and Antoniomathgini
April 17th, 2017, 01:11 PM   #3
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Quote:
 Originally Posted by ashesmi Can anyone here factor 100 numbers and spot all primes in 20 MINUITS?....Grade 4 students are currently doing it now I can show u the simple manual method...If u wish..If not that's cool
I could probably do it on a computer with between 10 and 20 lines of code using 4th grade mathematics.

-Dan

 April 17th, 2017, 02:08 PM #4 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,341 Thanks: 2463 Math Focus: Mainly analysis and algebra I should think it very much depends on the size and quantity of the factors. I'm certain I could do numbers less than 200 in under 20 minutes, probably also numbers less than 1000. Numbers of the order of $10^200$ would probably defeat me, even if the factors were quite small. Last edited by v8archie; April 17th, 2017 at 02:11 PM.
May 4th, 2017, 09:16 AM   #5
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Quote:
 Originally Posted by v8archie I should think it very much depends on the size and quantity of the factors. I'm certain I could do numbers less than 200 in under 20 minutes, probably also numbers less than 1000. Numbers of the order of $10^200$ would probably defeat me, even if the factors were quite small.

May 4th, 2017, 09:17 AM   #6
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 Originally Posted by topsquark I could probably do it on a computer with between 10 and 20 lines of code using 4th grade mathematics. -Dan

 May 4th, 2017, 09:17 AM #7 Newbie   Joined: Jan 2013 Posts: 19 Thanks: 0 Here is the solution https://m.youtube.com/watch?v=K9gKZNAWZ9M

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