Home » Questions » Unexperienced [ Ask a new question ]

Use 2,3,4,5 and 30 once each and the symbols +, -, ×, ÷ to get 29.

Use 2,3,4,5 and 30 once each and the symbols +, -, ×, ÷ to get 29.

Asked by: Guest | Views: 20
Total answers/comments: 1
Guest [Entry]

"Hi Sarahmaeobrero1,

This problem is a bit tricky, like those riddle math problems (like this one how to get 26 using 1 2 3 4). If you intend to answer it straight-forward, you won’t arrive to your expected answer. It is because the result that you need to arrive to (for our problem is 29) is a Prime number.

Prime number are natural numbers that has only two factors the number 1 and itself. For our problem, 29 has only two factors (1 and 29).

On the other hand, Composite numbers has factors which are more than 3. Let’s take the number 4 as an example. There are ways to have a product of 4, we can multiply 4 and 1 to have 4. Also we can multiply 2 and 2 to get 4. In essence 4 is a product of any of these numbers (1, 2 and 4)

This is the answer to your question,


I have used the PEMDAS rule in order to arrive to our expected answer. Here is how to solve it;





PEMDAS is the order of operations that governs all mathematical functions and equations. This rule helps everybody to understand which operation should come first before the other.

Arranging the numbers and the operations using the Parenthesis rule from PEMDAS made the problem much easier to understand rather than answering it straight-forward. In the Parenthesis rule, you need to solve first what is inside the parentheses before anything else.

You can take on any other math riddles like this (1 2 3 4 challenge answers or use the digits 1 2 3 and 4 to write an expression) using the same PEMDAS rule.

To know more about the PEMDAS rule, you may click on this link.


To understand Prime and Composite numbers you may click on this link,



Hope this helps!"