en_tn/2sa/24/03.md

multiply... hundred times

This means "that there will be 100 more people for every 1 person that there is now." (See:rc://en/ta/man/translate/translate-numbers)

king’s word was final against Joab

Joab and the other commanders of King David's army were not able to convince David to not take a census.

the king’s word

This phrase represents the kings command to them. (See: rc://en/ta/man/translate/figs-synecdoche)