How to display more than 65536 with MAX7219

[RussMartin]

The 6 digits numbers are a set of values like 123456 of which 123 represents 12.3ft and 4.56 metres.
there would be 10 sets of number like that which would be stores in the
pics eeprom so those 10 sets of number would take up 40 bytes of the eeprom.
My thinking was that instead of using 2 Max7219 both connected for 3 digits each and display 12.3 on one and 4.56 on the 2nd .

Then it looks to me like you don't need to use LONGs at all! In fact, I can't see how LONGs will help you.

In fact, it looks as if you are "multiplexing" two different numbers onto one display.

Since you are using only three digits per item, the largest of one of them (feet), even if multiplied by 10 for easy handling, is going to be 999, which is a lot less than 65,535, and the largest of the other (meters), even if multiplied by 100 for easy handling, is going to be 9999, which also is a lot less than 65,535. Each can be a WORD.

In fact, if you allow only three decimal positions for meters, it, too, can never be larger than 999.

Extract base 10 digits from each word as a binary-coded decimal (BCD) byte, then send each of them out along with a position address in a WORD for the display. Even the order you send them in doesn't matter much, since the word tells the display where that digit needs to appear.

What is the relationship between the two values being displayed? From where does the data come?