2 Samuel 10:18 says:
1 Chronicles 19:18 says:
The two verses do not contradict. 2 Samuel 10:18 describes the deaths of an unspecified number of men who rode in "seven hundred chariots". 1 Chronicles 19:18 describes the deaths of "seven thousand men" who rode in an unspecified number of chariots. In other words, 2 Samuel 10:18 gives the number of chariots and 1 Chronicles 19:18 gives the number of men. Therefore, putting the two verses together we know that there was an average of 10 men to each chariot.