It is 840 because 2 is less than 5
800
840
It ends with a 2, so it must be rounded down to 840.
It is already rounded to the nearest ten as 840
145
60
It is then 740 when rounded to the nearest ten.
30
36,184 rounded to the nearest ten thousands place is 40,000.
2602 rounded to the nearest ten is 2600.
320
20
260