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Author Topic: Recreational math  (Read 1664 times)

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JFoshia

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Re: Recreational math
« Reply #1 on: August 27, 2015, 10:51:12 am »
A quick little math trick: A Fibonacci Sequence problem.

Can you add these numbers up in your head?

2
2
4                            Here is the trick: Take the 7th number down (26)
6                            Add the tens digit to the number: 26+2=28
10                          Then you just tack on the ones digit at the end! 286
16                          So, all ten numbers in this sequence to the left will add up to 286 :)
26
42
68
110

JFoshia

  • Guest
Re: Recreational math
« Reply #2 on: August 27, 2015, 10:56:38 am »
Squaring 2-Digit Numbers That End In 5

Example:
  35
x35


The answer will end in 25 (because 5x5=25) so write that down.
Then, look at the tens digit (3). Multiply that number by the number that is one greater than it: 4
Write that answer in front of the 25.
So your answer will be 1,225

It works for squaring any 2-digit number that ends in 5.

           

 

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