# Simple Math riddle

I'm a number. The difference between me and my checksum is 36 and I am the product of two adjacent numbers. Which number am I?

I know it's pretty simple but one that just came to my mind right now =D

## 1 Answer

I think you are

$42$

Checksum

$42 - 4 - 2 = 36$

Product

$42 = 6 \times 7$

Method

It suffices to check the first few numbers which are the product of adjacent integers as the number itself grows much faster than the checksum and will surpass $36$ early on.

• Correct! Congrats =) – JohnyDoe Apr 27 '18 at 9:15
• I would like to add that if the difference between a number and its checksum is 36 you can now that the number will be between 40 and 49 . – JohnyDoe Apr 27 '18 at 13:54