How to read and write whole numbers. Powers of 10 -- A complete course in arithmetic Example 1. Read this number: Answer. Starting from the left, 256, read each three-digit group. Say: "256 Quadrillion, 312 Trillion, 785 Billion, 649 Million, 408 Thousand, 163." Do not say the class name "Ones." Example 2. Answer. Read the number: "8 million, 792 thousand, 456." Example 3. Answer. When a class is absent, we do not say its name; we do not say, "Seven billion, no million, ..." Also, every class has three digits and so we must distinguish the following: As for "and," in speech it is common to say "Six hundred and nine," but in writing we should reserve "and" for the decimal point, as we will see in the next Lesson. Example 4. Four hundred eight million, twenty-nine thousand, three hundred fifty-six. Answer. Example 5. Five billion, sixteen thousand, nine. Answer. Again, we must write "sixteen thousand" as 016; and "nine" as 009; because each class must have three digits. Example 6. At this point, please "turn" the page and do some Problems. or Copyright © 2017 Lawrence Spector
The meaning of decimals -- A complete course in arithmetic An ordinal number answers the question Which one? We will now see that the ordinal numbers express division into equal parts. An ordinal number names which part -- the third part, the fourth, the fifth, and so on. Division into equal parts If we divide 15, for example, into three equal parts -- into three 5's -- then we say that 5 is the third part of 15. We say that because 15 is the third multiple of 5: 5, 10, 15. If we divide a quantity into four equal parts, then we call each part a fourth; if into five equal parts, a fifth; if into one hundred equal parts, a hundredth; but if into two equal parts, we say half. And so with the exception of half, an ordinal number indicates into how many parts a quantity has been divided. A third, a fourth, a fifth, and so on, are the names of parts. We will go into this more in Lesson 15. The decimal system Since our numbering system is based on the powers of 10, it is called a decimal system. And so we have divided One into Hundredths.
Decimals, Fractions and Percentages Decimals, Fractions and Percentages are just different ways of showing the same value: Here, have a play with it yourself: Example Values Here is a table of commonly used values shown in Percent, Decimal and Fraction form: Conversions From Percent to Decimal To convert from percent to decimal: divide by 100, and remove the "%" sign. The easiest way to divide by 100 is to move the decimal point 2 places to the left: From Decimal to Percent To convert from decimal to percent: multiply by 100, and add a "%" sign. The easiest way to multiply by 100 is to move the decimal point 2 places to the right: From Fraction to Decimal The easiest way to convert a fraction to a decimal is to divide the top number by the bottom number (divide the numerator by the denominator in mathematical language) Example: Convert 2/5 to a decimal Divide 2 by 5: 2 ÷ 5 = 0.4 Answer: 2/5 = 0.4 From Decimal to Fraction To convert a decimal to a fraction needs a little more work. Example: To convert 0.75 to a fraction Answer: 3/8 = 37.5%
News Deeply — In-depth reporting on critical, complex topics Catalyst - ABC TV more stories > The Anthropocene: a new age of humans Tuesday, 15 November Human impacts on the way our planet functions have now become so extreme many scientists are claiming the Earth has shifted out of the Holocene state and into a new geological epoch. Swift Parrot Update Tuesday, 8 November Last year we brought you a story about the swift parrot - one of Australia's most charismatic birds, but also one of its most endangered. Tick Allergy With summer on our doorstep, and the odd BBQ or bush walk planned, we thought it timely to revisit this story: mammalian meat allergy is on the rise in Australia and the surprising cause is a tick bite. Medicinal Cannabis Tuesday, 1 November The anecdotal evidence that cannabis has a positive effect on a long list of medical conditions from epilepsy, pain, cancer, even Alzheimer's Disease is building.
VocabularySpellingCity | Build Literacy Skills with Vocabulary and Spelling theconversation During the past two decades, the US casino industry has expanded dramatically. According to the American Gaming Association, there are now nearly 1,000 commercial and tribal casinos in the country. Plans to expand casino gaming are typically controversial. Massachusetts presents one of the most interesting cases, with voters currently contemplating a measure to reverse casino legalization this coming Tuesday November 4. The cost benefit analysis Each time casino legalization or expansion is considered, similar issues come up. Opponents argue that the social costs, such as crime, industry “cannibalization,” and problem gambling, outweigh the potential benefits. When it comes to the economic benefits of casinos, there have been several studies on economic growth, employment, and wages. Controlling for a variety of factors, the results showed that counties with casinos have higher employment (by around 8%) than those without; wages were slightly higher in casino counties. Tax benefits