In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

How many bananas can you eat if your stomach is empty?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?