M51 arithmetic - Page 3

bsquared · 2019-01-10, 06:19

Could't resist one more - no parens are fun!

56 = 8 * 2 + 5 * 8 - 9/9 + 3/3

christian_ · 2019-01-10, 06:53

57 = 8 x 8 + 5 x 2 - 9 - 9 + 3/3

unconnected · 2019-01-10, 07:35

58 = 8 + 8 * 5 + 2 * 9 - 9 + 3/3

axn · 2019-01-10, 07:56

Quote:

Originally Posted by LaurV

[rant]
But this is fun activity, and posting 2-3 more lines from time to time is ENOUGH!

You (general you) don't need to post 100 lines, to show us that you know to add and subtract or know how to use Excel.
[/rant]

(9-9+3-3)
(9/9*3/3)
(9/9+3/3)
(9-9/3-3)
((9+9/3)/3)
(9/9-3-3)
(9-9+3+3)
(9/9+3+3)
(9-9/3/3)
(9*9/3/3)
(9+9/3/3)

*DROPS MIC*

LaurV · 2019-01-10, 08:58

Haha, now if we use only 8258 to make* 0, 10, 20, 30, +\(\infty\), then we are done...
If possible, only once, no parenthesis...

*technically, as you posted 0 to 10 inclusive, we would only need to make 0, 11, 22, 33, 44...

henryzz · 2019-01-10, 09:40

Actually they can be used to add or subtract 0 to 10 meaning a range of 21 not 11. Can this list be expanded? What can be done with just the last 3 digits?

59 = (8+2)*5+8 + (9/9*3/3)
60 = (8+2)*5+8 + (9/9+3/3)
61 = (8+2)*5+8 + (9-9/3-3)
62 = (8+2)*5+8 + ((9+9/3)/3)
63 = (8+2)*5+8 - (9/9-3-3)
64 = (8+2)*5+8 + (9-9+3+3)
65 = (8+2)*5+8 + (9/9+3+3)
66 = (8+2)*5+8 + (9-9/3/3)
67 = (8+2)*5+8 + (9*9/3/3)
68 = (8+2)*5+8 + (9+9/3/3)

The 5 axn posted was actually -5. Fortunately I checked my results. It is so easy to make a mistake with this puzzle!!

axn · 2019-01-10, 11:07

Quote:

Originally Posted by henryzz

The 5 axn posted was actually -5.

Yep, I tried to generate 5 but didn't really get anything. But since the intent was to do +/-, a -5 is as good as a 5.

henryzz · 2019-01-10, 11:16

Quote:

Originally Posted by axn

Yep, I tried to generate 5 but didn't really get anything. But since the intent was to do +/-, a -5 is as good as a 5.

Appending a - on the beginning did the trick. Would have been useful in your post.

I might consolidate correct results in the first post at somepoint. I will probably also make a list for the last 4 digits to aid with creating more.

houding · 2019-01-10, 13:48

69 = ((8 - 2 + 5 + 8 + (9/9) + 3)) * 3

axn · 2019-01-10, 13:57

Quote:

Originally Posted by henryzz

Appending a - on the beginning did the trick. Would have been useful in your post.

I wasn't sure about the legality of unary - operator. Anywho, I had already dropped the mic. You can't go back and pick it up again

axn · 2019-01-10, 14:03

Quote:

Originally Posted by henryzz

What can be done with just the last 3 digits?

For starters

Code:

9-3*3
9/3/3
(9-3)/3
9-3-3
(9+3)/3

2019-01-10, 08:58	#27
LaurV Romulan Interpreter Jun 2011 Thailand 23B0₁₆ Posts	Haha, now if we use only 8258 to make* 0, 10, 20, 30, +\(\infty\), then we are done... If possible, only once, no parenthesis... technically, as you posted 0 to 10 inclusive, we would only need to make 0, 11, 22, 33, 44... Last fiddled with by LaurV on 2019-01-10 at 08:58*

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2019-01-10, 06:19	#23
bsquared "Ben" Feb 2007 2⁵×3×5×7 Posts	Could't resist one more - no parens are fun! 56 = 8 * 2 + 5 * 8 - 9/9 + 3/3

2019-01-10, 06:53	#24
christian_ Jan 2016 Mighty Black Stump 10₁₆ Posts	57 = 8 x 8 + 5 x 2 - 9 - 9 + 3/3

2019-01-10, 07:35	#25
unconnected May 2009 Russia, Moscow 2⁵·79 Posts	58 = 8 + 8 * 5 + 2 * 9 - 9 + 3/3

2019-01-10, 09:40	#28
henryzz Just call me Henry "David" Sep 2007 Cambridge (GMT/BST) 2·2,897 Posts	Actually they can be used to add or subtract 0 to 10 meaning a range of 21 not 11. Can this list be expanded? What can be done with just the last 3 digits? 59 = (8+2)5+8 + (9/93/3) 60 = (8+2)5+8 + (9/9+3/3) 61 = (8+2)5+8 + (9-9/3-3) 62 = (8+2)5+8 + ((9+9/3)/3) 63 = (8+2)5+8 - (9/9-3-3) 64 = (8+2)5+8 + (9-9+3+3) 65 = (8+2)5+8 + (9/9+3+3) 66 = (8+2)5+8 + (9-9/3/3) 67 = (8+2)5+8 + (99/3/3) 68 = (8+2)5+8 + (9+9/3/3) The 5 axn posted was actually -5. Fortunately I checked my results. It is so easy to make a mistake with this puzzle!!

2019-01-10, 13:48	#31
houding "Adolf" Nov 2013 South Africa 61 Posts	69 = ((8 - 2 + 5 + 8 + (9/9) + 3)) * 3