The sum total of its sides.
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the tenths place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
6,453,321.9648 rounded to the nearest unit or whole number is 6,453,322
4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.
29.1 is approximate to0 to the nearest hundred30 to the nearest ten29 to the nearest whole number/unit
46.4 is approximate to0 to the nearest hundred50 to the nearest ten46 to the nearest whole number/unit
78.1 rounds to:100 to the nearest hundred80 to the nearest ten78 to the nearest whole number/unit
62.83 rounded to the nearest whole unit = 63
226.08 round to the nearest whole unit is 226
6,453,321.9648 rounded to the nearest unit or whole number is 6,453,322
3
4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.4 is an integer and so already rounded to a whole unit so to round to the nearest tenth you do nothing.
15.5 is approximate to0 to the nearest hundred20 to the nearest ten16 to the nearest whole number/unit
79.9 is approximate to:100 to the nearest hundred80 to the nearest ten80 to the nearest whole number/unit
29.1 is approximate to0 to the nearest hundred30 to the nearest ten29 to the nearest whole number/unit
46.4 is approximate to0 to the nearest hundred50 to the nearest ten46 to the nearest whole number/unit
78.1 rounds to:100 to the nearest hundred80 to the nearest ten78 to the nearest whole number/unit
40 litres!
365.3 rounds to:0 to the nearest thousand400 to the nearest hundred370 to the nearest ten365 to the nearest whole number/unit