you pick the nearest number you can count when you count by tens such as 52 rounds to 50 because 5 and under will go to the ten before and 6 and higher will go to the next ten
93 to the nearest tens = 90
390
907.457 rounded off to nearest tens place is 910. If it were asked to round off to nearest "tenths" place, it would have been 907.5.
1.145 rounded to the nearest tens is zero. To the nearest tenths it is 1.1
950
150
2941
It is: 450
It is: 290
It is: 50
1070
It is: 90