100 +1 = 101
7 +2 = 9
x = 909
909 + 3 = 912
Still working on 913
Where did I say that? If I did I made a mistake, a “better” solution uses fewer numbers. At least that’s what I remember, I will try to find the official rules online somewhere.
2 * 3 * (100 + 50 + 1) + 7
Working numbers: 1, 4, 9, 25, 50, 100
Target number: 735
735 = ((100 + 50 + 25 + 9) * 4) - 1)
Numbers are 2, 3, 5, 7, 7, 9; target is 877.
9 * 7 * 7 * 2 - 5
Working numbers: 1, 2, 4, 10, 10, 50
Target number: 481
(10 + 2) * 10 * 4 + 1
Working numbers: 2, 4, 5, 5, 9, 25
Target number: 367
((5+9) * (25+2)) - (5 - 4) = 367
1, 1, 3, 7, 9, 9, 10 Target is 777
You’d better check your math there, Quartz. ((5+9) * (25+2)) - (5 - 4) = 377.
(5 + 9) * (5 + 2) * 4 - 25 = 367
As for Quartz’s challenge,
3 * (10 + (1 + 1) * 9 + 9) * 7 = 777
New challenge:
Working numbers: 1, 5, 7, 7, 10, 100
Target number: 661
(I feel like somehow, the ones I generate I can solve much more easily, even though I use the auto-generator… Are other people not using the auto-generator? Does the auto-generator generate by randomly picking working numbers and a target or by randomly constructing an expression? Perhaps it’s all just confirmation bias…)
I don’t. I make up the number at random. Using the auto-generator means that the problem is solvable which takes the edge off the problem.
Which auto-generator are you talking about? The one on my webpage? Or another one?
The one on my webpage doesn’t check that the problem is solvable, it just picks numbers at random. Whenever I get to propose a problem (which I don’t do very much because it’s rare for me to get the correct solution first 
) I use the auto-generator on my page. If many of the auto-generator problems are easily solved, maybe that’s because in general the problems are easily solved?
On the other hand, when I use the auto-generator, I usually take 5 seconds to think about the problem to see if it has an obvious solution. If it does, I click the button and get another problem.
Oh, and by the way:
(100 + 10) * (5 + 1) + (7 / 7) = 661
New challenge (don’t blame me, it was auto-generated!):
Working numbers: 2, 4, 5, 6, 7, 9
Target number: 996
Ah, alright. Yeah, I was talking about your generator; just curious, though the more I think about it, the more I think it’s just confirmation bias from the few instances I’ve seen. But, like you say, there’s nothing preventing me from generating a new problem when I get an easy one.
:): 5 * (4 + 7) * 2 * 9 + 6
Next:
Working numbers: 1, 2, 8, 9, 10, 100
Target number: 467
(10 / 2) * (100 - 9 + 1) + 8 = 468?
Anything better? There must be.
P.S. Indistinguishable - 3 minutes to solve that last problem? I am impressed. Do you have a super-computer on your desk?
Thanks; all by hand, I’m afraid (well, hand and a basic calculator; I assume that’s ok, given that one is on the problem generation webpage?).
Also, the problem I gave is solvable.
9/2 x 100 + 10 + 8 - 1 = 467.
From the generator:
3, 4, 10, 25, 50, 75
Target 362. I’m pretty sure there’s a solution, though it’s harder than it looks at first.
4 * 75 + 50 + 25 - 10 - 3
Working numbers: 2, 4, 6, 10, 25, 50
Target number: 414
Well done! But all intermediate results are supposed to be integers, so in the French game they would expect you to write
9 * 100 / 2
and not
9 / 2 * 100