American Mental Arithmetic

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American Book Company, 1892 - Arithmetic - 160 pages

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Page 76 - Thirty days hath September, April, June, and November ; All the rest have thirty-one, Except the second month alone, Which has but twenty-eight, in fine, Till leap year gives it twenty-nine.
Page 135 - Pythagoras' theorem states that the square of the length of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the lengths of the other two sides.
Page 150 - If a hen and a half lays an egg and a half in a day and a half, how many eggs will three hens lay in one day?
Page 144 - A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. INTRODUCTION The specific gravity is the weight of any given volume of a substance divided by the weight of an equal volume of water. As both the weight and volume of wood vary with the amount of moisture contained in the wood, specific gravity as applied to wood is an indefinite quantity unless the conditions under which it is determined are clearly specified. The specific gravity of wood is generally...
Page 54 - Multiply together the numerators for a new numerator, and the denominators for a new denominator.
Page 50 - Multiplying or dividing both numerator and denominator by the same number does not change the value of the fraction.
Page 78 - PAPER. 12 units =1 dozen. 24 sheets =1 quire. 12 dozen = 1 gross. . 20 quires =1 ream. 12 gross = 1 great gross. 2 reams = 1 bundle. 20 units =1 score. 5 bundles = 1 bale.
Page 135 - The area of a parallelogram is the product of its base and its altitude ; ie, a=bh.
Page 53 - SUBTRACTION. Before fractions can be added or subtracted, they must be reduced to equivalent fractions having a common denominator.
Page 60 - L ft. 75. A can do a piece of work in 3 days, B can do 3 times as much in 8 days, and C 5 times as much in 12 days ; in what time can they all do the first piece of work ? Ans.

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