Have a look:



Although you can not read Persian, I think that you are able to understand that this is a homework of a primary school student. It reads:

Hasan invented 918 Kilograms of Uranium.He sent 213 kilograms to the Bushehr Power Plant and 348 Kilograms to the Natanz. How much Uranium does he have?

     918-(213+348)=358
     (918-213)-348=358


Reminds me of the soviets and their homeworks about Lenin Submarine and it's speed :)