45
45 and the nearest ten to 45.23 is 45.20
45 to the nearest tens place is 50.
45 is called 45 because most of us count in tens and it is a symbolic representation of 4 tens and 5 units. 45 is a number and has no physical existence. It therefore does not have any mm.
97
It rounds to 50
It is: 50
450 of them.
45
what is 3tens+18ones
4050
50