The computer that gives an approximate result after comparison is......
Answers
Answer:
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Explanation:
Approximate numbers arise from measurement or calculation. We can never perform a completely accurate measurement with a ruler, tape measure, or thermometer. There is always some inaccuracy involved, since we can always get a more accurate answer if we use a ruler (or other measuring device) with smaller units.
Later, on this page
Accuracy and Precision
Rounding off decimals
Operations with Approximate Numbers
Bar Notation
By comparison, exact numbers arise from counting. For example, the number of pens we can have is either 0 pens, 1 pen, 2 pens, 3 pens, and so on. Such quantities are exact.
Why does it matter? Our calculators often give us long answers containing many decimals. How many decimal places should we use in our answer? How many significant digits? What do we do when we multiply or add numbers with different significant digits?
Keep reading to find out the answers.
Significant Digits
All digits greater than 0 in a number are significant. For example, say we measure pipe diameter and get 26.832 cm. This number has 5 significant digits.
Rounding: We can round off 26.832 to 2 decimal places and get 26.83. (This means our measurement is closer to 26.83 cm than it is to 26.84 cm. Another way of thinking about this is that 26.83 is between 26.825 and 26.835.) Our rounded number 26.83 has only 4 significant digits.
What about 0? When is it significant?
Let's consider the number 26.830. This suggests greater accuracy than our rounded number 26.83. The zero in 26.830 is significant.
A zero digit is significant if it is not a place holder. [Another way of thinking about this is that the number of significant digits is the number of digits we write when we write the number in scientific notation].
Let's now round our earlier measurement 26.832 cm to the nearest 10. This is 30 cm. The zero in this number serves as a place holder - it is not a significant digit