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Not necessarily. Take this example:
89 ÷ 44
The rounding rules are clear. 89 goes to 90, 44 goes to 40, 90 ÷ 40 = 2.25
Compatible numbers can be altered by the relationships between them. 89 is close to 90, 44 is close to 45, 90 and 45 have a relationship that is easy to compute.
90 ÷ 45 = 2
In this case, the estimate provided by compatible numbers is closer to the real total than the one provided by rounding.
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Are compatible numbers and rounding different And in what ways?
Yes, they are a bit different, but not by much. In compatible numbers, you pick numbers that are close to make it easier to solve your problem. Here's an example: Say a Mom or Dad has $187.45 to spend buying Christmas presents for their three kids. They decide that they want to spend about the same amount of money for each kid, but it doesn't have to be exact. You could get a pencil and paper out and divide 187.45 by 3 and get 63.483333333... OR you could just round down 187.45 to 180 and divide it by 3 much easier. (Probably in your head!) The reason 180 and 3 are compatible numbers is because they divide easier since 3 goes into 18 evenly. Rounding is a bit more accurate depending on how close you need to round. 187.45 can be rounded to 187.5 if you are are rounding to the nearest tenth, or 187 if you're rounding to the nearest whole number, or 190 to the nearest tens or 200 for the nearest hundred.
What are divisibile numbers?
Divisibile numbers means the same thing as dividing and the numbers are 2,4,6,9and 10.
Rounding to the nearest tenth of a cm?
Is the same as rounding to the nearest millimetre.
What numbers could be rounded to 460?
Any number between 455.5 and 464.5 could be rounded to 460. When rounding a number, if the digit to the right of the rounding position is 5 or greater, the rounding position is increased by 1. If the digit is less than 5, the rounding position remains the same. Therefore, any number within this range would round to 460.
Rounding off to the first digit is called?
Rounding to the first digit is simply called rounding. This will make the number equal to the same as what the number truly is.
