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Read this number: 100

How many letters are there in its number name?

7

The number is 100 and the number of letters in its number name is 7.

Now tell me a number in which the number of letters in the number name is equal to the number itself.

Answer: 4

Read this number: 100

How do you spell it?

H U N D R E D

Are the letters in the alphabetical order? Of course, no.

Now, tell me a number name in which the letters are in the alphabetical order.

Hint 1: It's a two-digit number.

(There is only one number in whose name the letters are in the alphabetical order.)

Hint 2: It has zero in the Ones place.

Two-digit numbers having zero in the Ones place: 10, 20, 30, 40, 50, 60, 70, 80, 90

Answer: 40 (F O R T Y)

What is the square of 12?

What is the number you get when you reverse the digits in this? What is its square?

What do you notice?