How do I calculate the number of exemptions my 18 y/o should claim making less than $1,700 from his first summer job this year (2019) in Michigan (MI-W4)?

[Michigan-Tom]

(I edited the question for clarity) He is a full-time student and is planning to not have any other jobs this year. The MI-W4 item #6 states: "Enter the number of personal and dependent exemptions you are claiming:"

Michigan personal exemption amount for 2018 is $4050. How do I calculate the "number of exemptions" he should be claiming?

[fanfare]

refer to the MI Dept of Revenue tax return Instructions for who must file based on income and circumstance.
He probably does not need to file a return unless tax was withheld.

[fanfare]

file a tax return to get your tax refund.