Answer:
740,000
Step-by-step explanation:
The ten-thousands digit is the 4.
Change all digits to the right of the 4 to 0.
742,617 becomes 740,000.
Since the first digit to the right of the 4 is 2, and not a digit from 5 through 9, we keep the 4 and do not change it to 5.
Answer: 740,000
