Skip to main content

Questions tagged [number-property]

Puzzles that use number properties such as even and odd, multiples of numbers, part of a well-known sequence (i.e. Fibonacci) or theorem (Pythagorean relations) or others in part of the method to solve the question.

Filter by
Sorted by
Tagged with
8 votes
2 answers
269 views

Half and Double Value

A 3 year old child tried to input or copy a number (written on the paper) to a calculator but he messed up with the digit places. All the digits are there but the value of the number he inputed ...
TSLF's user avatar
  • 6,656
13 votes
1 answer
384 views

What is a Voluminous Number™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a number conforms to a special rule, I call it a Voluminous Number™. Use the ...
Jamie Barker's user avatar
  • 1,515
2 votes
3 answers
515 views

72 + 96 = 120, is it possible?

I came across the following riddle: How is it possible for $72+96=120$ to be correct?
1123581321's user avatar
4 votes
1 answer
255 views

systematic number removal [duplicate]

The whole, natural numbers 1 through 50 are written on a board. The following operation is performed 49 times: select any two of the numbers on the board and write the absolute value of their ...
user18842sos's user avatar
17 votes
3 answers
7k views

Which two students spoke wrongly? [duplicate]

A teacher wrote a large number on the board and asked the students to tell about the divisors of the number one by one. The 1st student said, "The number is divisible by 2." The 2nd student said, "...
Lifesaving Linen's user avatar
6 votes
1 answer
258 views

What do numbers have?

Numbers 0 through 9 each have a number of something. 0 has 6. 1 has 2. 2 has 5. 3 has 5. 4 has 4. How many do 5, 6, 7, 8 and 9 have?
ibrahim mahrir's user avatar
22 votes
2 answers
2k views

What is a RAP Number™?

Taking inspiration from "What is the word™" series, here the numbers conforms to a special rule, I call it a RAP number™. Use the following examples below to find the rule. RAP number™ NOT ...
smriti's user avatar
  • 4,465

1 2
3