Applied Arithmetic: Book 3 (1920)

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J.B. Lippincott Company, 1920 - Arithmetic
Three-book series is intended to cover the work in Arithmetic of the second, third, and fourth grades. The principles which have guided the authors may be grouped under three main heads: 1. Selection and organization of subject matter; 2. Derivation and application; and 3. Motivation.--From preface.
 

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Page 47 - A number is divisible by 9 if the sum of its digits is divisible by 9.
Page 238 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Page 244 - Art. 338, that in a proportion, either extreme is equal to the product of the means, divided by the other extreme ; and either of the means is equal to the product of the extremes, divided by the other mean.
Page 49 - Both terms of a fraction may be divided by the same number without changing the value of the fraction.
Page 44 - A fraction is one or more of the equal parts of a unit...
Page 255 - To find the diameter of circle having given area: Divide the area by .7854, and extract the square root. To find the volume of a cylinder: Multiply the area of the section in square inches by the length in inches = the volume in cubic inches. Cubic inches divided by 1728 = volume in cubic feet.
Page 316 - The unit of weight is the GRAM, which is the weight of one cubic centimeter of pure water weighed in a vacuum at the temperature of 4 deg.
Page 242 - The Ratio of one number to another is the quotient obtained by dividing the first number by the second. Thus, the ratio of a to b is - ; and it is also expressed a : b.
Page 66 - Hence, to reduce a common fraction to a decimal, Divide the numerator by the denominator.
Page 81 - If 12 men can do a piece of work in 10 days, how long will it take 1 man to do it ? How long will it take 8 men ? How long 6 men ? 9.

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