The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

What's a single-digit number with no value?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

What does this mathematical rebus means ?