# A Mental Arithmetic Upon the Inductive Plan: With Easy Exercises for the Slate : Designed for Primary Schools

Robert S. Davis and Company, 1860 - Arithmetic - 72 pages
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### Contents

 Section 1 1 Section 2 2 Section 3 7 Section 4 9 Section 5 11 Section 6 14 Section 7 16 Section 8 22
 Section 15 63 Section 16 92 Section 17 94 Section 18 96 Section 19 105 Section 20 107 Section 21 109 Section 22 133

 Section 9 40 Section 10 42 Section 11 45 Section 12 52 Section 13 56 Section 14 61
 Section 23 135 Section 24 141 Section 25 148 Section 26 154 Section 27 Section 28

### Popular passages

Page 28 - If two men start from the same place, and travel in opposite directions, the one travelling at the rate of 3 miles an hour, and the other at the rate of 4 miles an hour, how far apart will they be at the end of 5 hours ? 11.
Page 122 - Multiplication is the process of taking one number as many times as there are units in another number.
Page 55 - NUMBERS. 12 units = 1 dozen. 12 dozen — 1 gross. 12 gross = 1 great gross. 20 units = 1 score.
Page 50 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30j square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq.
Page 46 - TROY WEIGHT. 24 grains (gr.) = 1 pennyweight (pwt.). 20 pennyweights = 1 ounce (oz.). 12 ounces = 1 pound (lb.). 351. Apothecaries' weight is used in mixing medicines and in selling them at retail. APOTHECARIES
Page 53 - DRY MEASURE 2 pints (pt.) = 1 quart (qt.) 8 quarts =1 peck (pk.) 4 pecks = 1 bushel (bu...
Page 47 - AVOIRDUPOIS WEIGHT. 16 Drams (dr.) make 1 Ounce, oz. 16 Ounces " 1 Pound, Ib. 25 Pounds " 1 Quarter, qr. 4 Quarters " 1 Hundred-weight, cwt. 20 Hundred-weight
Page 114 - A cistern has 4 pipes ; the first will fill it in 2 hours, the second will fill it in 3 hours, the third in 4 hours, and the fourth will empty it in 2 hours ; now, if the pipes are all open at the same time, how long •will it take to fill the cistern ? 10.
Page 66 - When the numerator is less than the denominator, the fraction is called a proper fraction ; when the numerator is equal to or larger than the denominator, the fraction is called an improper fraction ; when a fraction is joined with a whole number, the expression is called a mixed number.