# Questions tagged [formation-of-numbers]

For puzzles about forming numbers using other numbers and mathematical operations.

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### Make numbers 1-30 using 2, 0, 1, 9

This is very similar to the 2, 0, 1, 8 problem. Just try to make all numbers 1-30 using the digits 2, 0, 1, 9. Rules: Use all four digits exactly once Allowed operations: +, -, x, ÷, ! (factorial), ...
4k views

### Get 59 from 1,9,4,8 in order [closed]

I’m stuck on trying get $59$ by the numbers $1,9,4,8$ in order. I have no idea if it’s possible, I made it for 1-70 just not 59. I made it without order: $(-1+8)*9-4$ You can use not only the basic ...
257 views

### Making 30 using 3 3s [closed]

Hope that all can answer the question. It's an IQ! How can one make 30 using 3 only three times?
328 views

### find out the missing expressions [closed]

10 10 10 10 = 1 10 10 10 10 = 2 10 10 10 10 = 3 10 10 10 10 = 4 10 10 10 10 = 5 10 10 10 10 = 6 10 10 10 10 = 7 10 10 10 10 = 8 10 10 10 10 = 9 10 10 10 10 = 10 You can only add ...
613 views

### Ode to convergence

Taking a numeral core (digits: a non-quad four) digits I ordered, then lesser I minused, till evolve I couldn't more. What is this unfathomably clunky poem all about?
277 views

### Puzzling Number Boxes

Found this puzzle as a translation question. The Chinese is fairly simple, it just asks to solve for the ? in the bottom right square. The actual puzzle though, I have no clue about. Can any of you ...
464 views

### What is the smallest counting number you can create higher than 1? [closed]

What is the smallest integer you can create using 1,2,3,4,5,6,7,8,9 that is strictly greater than 1? You can use any mathematics symbol. You must use all nine numbers. You can't use the same number ...
280 views

### Numbers and Countries

The relations given below. According to these values, solve the last relationship. Germany - Kenya = 7 Mexico - Brazil = 9 Turkey - Australia = 18 Norway - Ghana = 7 Korea - ...
1k views

### Pick seven numbers so that every operation gives same result

Pick seven numbers so that every operation (addition, subtraction, multiplication, but not division) gives the same result. For subtraction, you may take the result's absolute value. Numbers cannot ...
2k views

### Mathematics IQ puzzle, solving puzzle by looking at neighboring digits [closed]

Can anyone solve this puzzle? I have tried many times but I could not find any symmetry or sequence. \begin{array} {|c|c|c|} \hline 3&25&5\\ \hline 16&9&6\\ \hline 125&36&18\\ ...
874 views

### IBM Research Puzzle – 5-ops implementation of erasure code

I found this interesting puzzle on IBM Research Puzzling Page called Ponder This; specifically, here. Design a storage system that encodes 24 information bits on 8 disks of 4 bits each, such that: ...