Relevance and Application:
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The use and understanding algorithms help individuals spend money wisely. For example, compare discounts to determine best buys and compute sales tax.
Estimation with rational numbers enables individuals to make decisions quickly and flexibly in daily life such as estimating a total bill at a restaurant, the amount of money left on a gift card, and price markups and markdowns.
People use percentages to represent quantities in real-world situations such as amount and types of taxes paid, increases or decreases in population, and changes in company profits or worker wages.