Questions tagged [formation-of-numbers]
For puzzles about forming numbers using other numbers and mathematical operations. Use with [mathematics]
31
questions
-1
votes
3
answers
138
views
2,3,6,7 to get 10 [closed]
How do I use the numbers 2,3,6,7 to get 10? You can also make numbers like 23 or 76 too.
- 29
8
votes
1
answer
1k
views
Making 1353 using Four fours
As the title says, the goal for this puzzle is making 1353 out of simply 4, 4, 4 and 4. Concatenation is not allowed. Here are all of the allowed operators.
Addition (+), Subtraction and negatives (-)...
- 383
-4
votes
3
answers
160
views
Use 1 6 7 8 (all numbers) to equal 2 [closed]
Create an equation using 1, 6, 7 and 8 to equal 2.
Can use brackets, plus, minus, subtract, multiply.
- 11
5
votes
1
answer
144
views
Number relations in a number table
I found this puzzle in a school study group. Choices are 9, 10,11, 12, 13.
$$ \begin{array}{|c|c|c|c|} \hline 22& 22 & 23 & 24 \\ \hline 22 & 32& 41& 52\\ \hline 23 & 41 &...
- 53
-2
votes
2
answers
221
views
How do you make numbers 1 - 100 using the digits "2 0 2 4"? [closed]
I'm trying to complete this "2024 Challenge", but I'm still missing quite a lot of numbers. I need your help to finish this challenge. All answers are appreciated.
Rules:
Use all 4 digits ...
1
vote
0
answers
176
views
Can you obtain a given set of numbers by halving a chosen number? [closed]
Given a set of numbers, I want to check if it is possible to produce the full set of numbers by repeatedly splitting one single starting number into its halves and doing the same for each of the ...
- 39
6
votes
4
answers
415
views
Approximate ln(2) out of small numbers
Given numbers 1,2,...n, the goal of this puzzle is to make a number as close to the mathematical constant $\ln(2) ≈ 0.69314718055$ as possible.
Rules
You can only use the four mathematical ...
- 2,423
-2
votes
1
answer
110
views
How to make all the numbers ranging from 1-30 only using the numbers 1, 5, 0, 4 [closed]
You can use the numbers 1, 5, 0, and 4 but you can't square and cube, you can't use any other numbers, you can't use the numbers more than once, your answer can't be rounded, and you MUST use all the ...
- 11
0
votes
1
answer
163
views
Getting The Numbers 33 Through 99 Only Using 2, 0, 2, and 4 [closed]
How do you get the numbers 33-99 by using the numbers 2,0,2,4
- 29
5
votes
4
answers
439
views
How to make 2012 by using 2, 0, 1, 2?
How to make $2012$ by using $2, 0, 1, 2$?
Allowed Operations:
Addition, Subtraction, Multiplication, Division, $!$ (factorial), subfactorial ( $!n$), primorial (product of the first $n$ primes), ...
- 265
6
votes
4
answers
761
views
How to get the numbers from 50 - 100 with the numbers 2, 0, 2, 4
All I need is 56-59, 69, 73, 75- 77, 79, 86, 90-94, 99. I've done the rest but I would love to hear other solutions.
Rules:
Use any of the following operations: basic operations (+ - x /), to the ...
- 79
-2
votes
1
answer
145
views
Make numbers 1 - 30 using the digits 2, 0, 2, 5
Try to make all numbers 1-30 using the digits 2, 0, 2, 5.
Rules:
Use all four digits exactly once.
Allowed operations: $+,−,×,÷,!
\text{ (factorial)}, !! \text{ (double factorial)}, !!! \text{ (...
- 438
0
votes
1
answer
96
views
Insert operators into 3 5 7 = 7 [closed]
How can you insert any math symbol/operation () ! - + x / square root etc into 3 5 7 = 7 without adding any numbers or changing the order? For example, 3-7+5=1 or 3+7-5=5.
Also, try to solve 3 7 5 = 2,...
- 27
18
votes
4
answers
5k
views
Make 27 using 1, 1, 1, 1
Make the number 27 using 4 instances of the digit 1. You must use all 4 digits to make it count.
Here are the allowed operators:
Addition (+), subtraction (-), multiplication (*), division (/)
Square ...
- 383
4
votes
2
answers
511
views
Make expressions equal to 6 using exactly four 4s
You must use all four 4s.
You may use addition (+).
You may use subtraction (-).
You may use multiplication, such as with asterisks (*) and/or grouping symbols.
You may not use any division.
You ...
- 1,788