Hex to Decimal

Hey, I'm working on RF connection with arduino in which I'm using 433Mhz RF module to communicate between two arduino uno using virtual wire. I'm sending counter value to RX arduino and it is showing integer value on serial monitor but when I'm displaying it on seven segment multiplexing module value after 9 shows in hex format. How to convert it into decimal no.

after 9 you may be need to extract each value and save it in an array.. ex: if value is 10 take 0 first then put in an array one position next take 1 put it in array next position and so

How do you transmit the value and compute the display digits?