Rounding

Rounding means reducing the digits in a number while trying to keep its value similar.  The result is less accurate, but easier to use.

Example: 73 rounded to the nearest ten is 70, because 73 is closer to 70 than to 80.

The method we use in class 403
There are several different methods for rounding,  but in class 403 we will use the rounding rollercoaster:)
How to Round Numbers?
Decide which is the last digit to keep.
Leave it the same if the next digit is less than 5 (this is called rounding down) But increase it by 1 if the next digit is 5 or more (this is called rounding up)

Example: Round 74 to the nearest 10
We want to keep the "7" as it is in the 10s position
The next digit is "4" which is less than 5, so no change is needed to "7"
Answer: 70=74 gets "rounded down"

Example: Round 86 to the nearest 10
We want to keep the "8"
The next digit is "6" which is 5 or more, so increase the "8" by 1 to "9"

Answer: 90=86 gets "rounded up"

We watched a video today by Khan Academy and worked on our ISN.