# Arithmetic

Q:

## What is the history of the square root in mathematics?

A:

According to Saint Louis University, the ancient Egyptians created the square root and most likely used it for architecture, building pyramids and other daily activities that required math. Most of the present-day knowledge of Egyptian math comes from papyri written during the 12th dynasty.

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• #### Q:What are the parts of a multiplication problem?

A: The basic parts of a multiplication problem consist of at least two factors that are multiplied together to result in one product. More than two factors can be involved in a multiplication problem, but the answer always consists of only one product.
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• #### Q:What are some facts about the abacus?

A: The abacus is a counting frame used since ancient times as a calculating device. The word abacus is derived from the Greek word "abax" meaning "flat surface."
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• #### Q:What is an array in math?

A: In mathematics, an array is a set of numbers or objects placed in rows or columns. Arrays are often used to represent multiplication or division.
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• #### Q:In mathematical terms, what does "factor" mean?

A: A factor is a number or expression that divides another number or expression evenly without a remainder. For instance, two, four, five and 10 are factors of 20 because 20 can be divided by all those smaller numbers an exact number of times. Prime numbers are positive integers greater than one that have exactly two factors. A composite number has more than two factors.
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• #### Q:How many thousands are in one million?

A: One million has exactly 1,000 thousands in it. Simply divide the number 1,000,000 by 1,000 in order to find the answer to this math problem.
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• #### Q:What are the notable mathematical problems that feature pi?

A: Some mathematical problems that feature pi are the area of a circle, a circle's circumference, arc length and the different surface area and volume formulas for a cone, sphere and cylinder. In mathematics, the ratio between a circle's circumference and diameter is given as pi.
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• #### Q:How big is a stack of one trillion dollar bills?

A: A stack of one dollar bills equals \$100 and measures .43 inches high, which means that \$1 trillion dollar bills would stack to a height of approximately 67,866.16 miles. The moon is about 238,855 miles from the Earth, which would require a stack of \$3.5 trillion dollar bills to reach.
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• #### Q:How do you change a fraction to a percent?

A: A fraction is converted to a percentage by first expressing the fraction with a denominator of 100, then writing the numerator with a percent sign behind it. Some fractions can be easily converted if basic ratio equivalents are known.
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• #### Q:How much money is in a roll of quarters?

A: In the United States, a roll of quarters is worth \$10. It includes 40 quarters.
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• #### Q:What does "median" mean in mathematics?

A: The median is the number that is in the middle in a list of sorted numbers. To find the median, the numbers must be sorted from lowest to highest.
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• #### Q:How did Albert Einstein come up with E=mc^2?

A: Before Albert Einstein came up with his equation E=mc^2, the scientific world believed that mass and energy were two independent phenomena in the universe. However certain occurrences, such as radioactive emissions could not be explained by this divide between mass and energy. Einstein worked out the equation by assuming the speed of light was constant to provide the link which would later explain how stars worked as well.
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• #### Q:What are cool math games?

A: A cool math game that is available online is "2048" and is offered as a mobile application. Cool Math 4 Kids offers math games geared toward children, including "The Timernator" and "Arithmetic Game."
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• #### Q:What is the history of the square root in mathematics?

A: According to Saint Louis University, the ancient Egyptians created the square root and most likely used it for architecture, building pyramids and other daily activities that required math. Most of the present-day knowledge of Egyptian math comes from papyri written during the 12th dynasty.
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• #### Q:What is a "digit" in math?

A: "Digits" are the symbols or characters used to represent a number visually. A number like five contains one digit, whereas a number like 555 contains three digits. This is easily seen when they are written as numerals: 5 versus 555.
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• #### Q:How do you multiply fractions with different denominators?

A: To multiply fractions, multiply the first numerator by the second numerator and the first denominator by the second denominator. The product of the two numerators becomes the numerator in your answer, and the product of the two denominators becomes the denominator in your answer. When finished, always be sure to simplify your answer to its lowest term.
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• #### Q:How is math used in the real world?

A: Math is useful for economics, science, sports, social fields and a wide range of other areas for making decisions and analyzing information. Basic math skills are essential for many jobs. Math has been a core component of many human advances.
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• #### Q:Who created numbers?

A: The Babylonian society used a cuneiform method of writing that included numerical characters; this is the earliest-known form of numbers, meaning that, as far as humans know, the Babylonians created numbers. This system of numerical writing is about 5,000 years old, and it is a base-60 system as opposed to a base-10 system, which is what most humans use for counting and mathematics in the modern world. Time measurements, in which an hour consists of 60 minutes and a minute consists of 60 seconds, are one example of a sexidecimal, or base-60, numerical system that is alive and well in the modern world.
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• #### Q:Who is the father of mathematics?

A: Greek mathematician Archimedes is widely considered by many to be the "father of mathematics." He is regarded as one of the leading scientists in classical antiquity and is credited with designing numerous innovative machines, including the screw pump and siege engines.
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• #### Q:How many ounces of water makes a gallon?

A: There are 128 U.S. fluid ounces in a U.S. gallon of water. Furthermore, there are 160 imperial fluid ounces in an imperial gallon. The U.S. ounce and gallon are used in the United States, while the imperial versions of these units of measurements are used in Britain.
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• #### Q:Why are high school math word problems important?

A: Math word problems are important for high school students because they help develop a conceptual understanding of the processes involved in arriving at solutions and enhance students' abilities to communicate mathematically. Word problems also may help students become more interested in math by showing how concepts they have been studying abstractly can be put to use in real-world situations.
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• #### Q:How do you calculate the sum of an arithmetic sequence?

A: Calculate the sum of an arithmetic sequence with the formula (n/2)(2a + (n-1)d). The sum is represented by the Greek letter sigma, while the variable a is the first value of the sequence, d is the difference between values in the sequence, and n is the number of terms in the series.
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