+0  
 
0
4252
3
avatar

What is 1/81 as a decimal

 Oct 7, 2014

Best Answer 

 #3
avatar
+5

Personally i like 1/7 = 0,142857(142857)... 

We see that that the the two first decimals are 14 (7*2) followed by 28 (14*2) followed by 57 (28*2+1). Closely related are 22/7, used to approximate pi. 22/7 = 3,142857(142857)...

 

Other well known fractions are: 1/3 =0,33(3)...; 1/9=0,11(1)...; 1/11 = 0,0909(09)...; 1/6 = 0,166(6)...; and 1/14 = 0,07142857(714285)...

 Oct 7, 2014
 #1
avatar+354 
+5

$${\frac{{\mathtt{1}}}{{\mathtt{81}}}} = {\mathtt{0.012\: \!345\: \!679\: \!012\: \!345\: \!7}}$$

Oh ok. I see.

This pattern works with $${\frac{{\mathtt{1}}}{{{\mathtt{99}}}^{{\mathtt{2}}}}}$$ which gives all the 2 digit numbers - 1 of them.

 Oct 7, 2014
 #2
avatar+128731 
+5

RADIO......I love this kind of stuff  .....note another couple of neat ones you might find interesting.........

10000/993 = .0103061015212836     ........each pair  of digits, starting from the left, is the sum of the first n digits (it fails after awhile!!)

1/9899 = .0001010203050813         ........each pair  of digits, starting from the left, begins the Fibonacci series  [00 being  Fib(0) ]

 

 Oct 7, 2014
 #3
avatar
+5
Best Answer

Personally i like 1/7 = 0,142857(142857)... 

We see that that the the two first decimals are 14 (7*2) followed by 28 (14*2) followed by 57 (28*2+1). Closely related are 22/7, used to approximate pi. 22/7 = 3,142857(142857)...

 

Other well known fractions are: 1/3 =0,33(3)...; 1/9=0,11(1)...; 1/11 = 0,0909(09)...; 1/6 = 0,166(6)...; and 1/14 = 0,07142857(714285)...

Guest Oct 7, 2014

2 Online Users

avatar
avatar