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Why do you use percents?
Percents are basically decimals, and we use decimals as numbers with extra, tiny proportions. Percents are just ways to make those decimals into a whole, more friendlier number. But, percents can also be made with decimals as well.
Subtracting negative and positive decimals?
By doing this it aligns all the place values so you can clearly add or subtract the correct place values and get a correct answer. You might say it is an organization technique. Of course if you use a calculator, this is not necessary.
Examples of decimals in real life?
One of the most common instances will be money! Whenever we have some number of cents that do not add up to a full dollar, we express the amount as a decimal. For example, $3.75, $12.69, and even $1.00 are all examples of decimals. Decimals are also used in measurements of all types. You might be told to take 2.5 tablespoons of a medicine twice per day, have a weight of 95.1 pounds, have to buy carpeting for a room measuring 12.3 x 16.8 feet, etc. Decimals are frequently used in science, from laboratory experimental data to certain well-known scientific constants (for instance, g is often treated as 9.8 ms^-2 and Avogadro's number for the number of particles per mole is approximately 6.02 x 10^23). All of these use decimals.
What is pi to 14 decimals?
Pi. 3.14159265358979
Are repeating decimals rational or irrational numbers?
Repeating decimals are rational numbers if there is a pattern, like 0.22222222. If it is not a pattern, like 0.568964329, it is an irrational number.
