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you just look if the number in the side is larger than 5-9 go up on number and make on right zero if no larger than 5-9 keep same number and make every thing zero on right 4.89 = 5.00 9876.2543 = 9876.0000 nine thousand eight hundred seventy-six and two thousand five hundred forty-three millionths is you know the rest
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How do you estimate decimal sums and differences?
The basic idea is the same as when you estimate sums and differences of larger numbers (which may or may not be integers). You round the numbers to one or two decimal digits, then add them up.
What are two ways in which whole numbers and decimal numbers are different?
Whole numbers are a proper subset of decimal numbers. All whole numbers are decimal numbers but not all decimal numbers are whole numbers.
Why might you need to be able to estimate an irrational numbers?
Because rational numbers aren't able to be notated precisely in decimal form. They don't stop.
How can you estimate the sum of a decimal and a fraction?
The simplest is to convert both into the same form. Whether you choose to go for two decimal numbers or two fractions is a matter of personal preference. Add the two parts together and you have your estimate.
Why do you estimate when adding or subtracting decimal numbers?
In more than 40 years as a mathematician, I have never needed to do so.
