Addition and division are both operations the are used for rounding. To round, the person needs to find the mean, to find the mean get a set of numbers like 5,7,1,9,3 and then add them altogether which would make 25. Then divide them by the amount of numbers there are which makes 5.
Here comes the rounding part comes in so if the numbers are 5-9 they are called high five and the numbers that are 0-4 they are called four floor. Look for the last digit. Example: 21.85 now becomes 21.9 because 5 is above.
LI investigate units of time.
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