A Mental Arithmetic, on the Inductive Plan: Being an Advanced Intellectual Course, Designed for Common Schools and Academies

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R. S. Davis, 1872 - Mental arithmetic - 180 pages
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Page 82 - Multiplying the numerator and denominator of a fraction by the same number does not alter the value of the fraction.
Page 30 - ... miles an hour, how far apart will they be at the end of 1 hour ? At the end of 2 hours ? 4 hours ? 10 hours ? Why ? 4.
Page 25 - Multiplication is the process of taking one number as many times as there are units in another number.
Page 140 - Three men, A, B and C, are to share $400 in the proportion of J, and ^ respectively ; but, as C died, it is required to divide the whole sum properly between the other two ; how much should each receive ? 20.
Page 33 - The Dividend is the number to be divided. The Divisor is the number by which we divide.
Page 27 - If 46 men can do a piece of work in 60 days, how many men will it take to do it in one day ? 4.
Page 62 - MISCELLANEOUS TABLE. 12 units make 1 dozen. 12 dozen " 1 gross. 12 gross " 1 great gross. 20 units " 1 score. 24 sheets of paper " 1 quire. 20 quires " 1 ream. 56 pounds " 1 bushel of corn. 60 pounds " 1 bushel of wheat. 196 pounds " 1 barrel of flour. 200 pounds { l bari;el, of beef, pork
Page 139 - ... 7. A cistern has 3 pipes ; the first will fill it in 2 hours, the second in 3 hours, and the third in 6 hours ; how long will it take them all to fill it ? 8. A cistern has 2 pipes ; the first will fill it in 2 hours...
Page 153 - В start from the same point, and travel in the same direction around a square, each side of which measures 5 miles ; A travels at the rate of 4| miles an hour, and В at the rate of 3 miles an hour ; in what time will they be together again ? How many miles will each have travelled ? How many times will each have been around the square ? 43.
Page 51 - TABLE. 10 Mills (m.) make 1 Cent, marked c. 10 Cents " 1 Dime, " d. 10 Dimes " 1 Dollar, . " $. 10 Dollars " 1 Eagle,

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