Final answer:
The truck driver's mileage in standard form is 120,352. It is crucial to place each digit correctly according to its place value.
Step-by-step explanation:
The truck driver traveled one hundred twenty thousand, three hundred fifty-two miles last year. Written in standard form, this number is 120,352. It is important to ensure that each digit is in the correct place value, so 'one hundred twenty thousand' translates to 120,000, and 'three hundred fifty-two' translates to 352, which combined equals 120,352.