Answer: Hello there!
We know that Jada has 12 books checked out, and Han has one third less than that.
one-third of a number is equal to the number divided by 3, in this case, we have the number 12, so a third of 12 is: 12/3 = 4
then if Han has a third less than 12, Han has 12 - 4 = 8 books checked out.