# A Mental Arithmetic

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### Contents

 Section 1 1 Section 2 50 Section 3 70 Section 4 74 Section 5 78 Section 6 80
 Section 7 107 Section 8 115 Section 9 126 Section 10 127 Section 11 145

### Popular passages

Page 63 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq.
Page 67 - TIME 60 seconds (sec.) = 1 minute (min.) 60 minutes =1 hour (hr.) 24...
Page 56 - Dry Measure 2 pints (pt.) =1 quart (qt.) 8 quarts = 1 peck (pk.) 4 pecks = 1 bushel (bu.) 2150.42 cu.
Page 65 - CUBIC MEASURE 1728 cubic inches (cu. in.) = 1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu. yd.) 128 cubic feet = 1 cord (cd...
Page 61 - LENGTH 12 inches (in.) = 1 foot (ft.) 3 feet = 1 yard (yd.) 5| yards = 1 rod (rd.) 320 rods = 1 mile (mi.) 1 mile = 1,760 yd.
Page 60 - TROY WEIGHT is used in weighing gold, silver, and precious stones. TABLE. 24 Grains (gr.) make 1 Pennyweight, dwt.
Page 66 - We express the length- breadth, and thickness in units of the same denomination ; then we multiply the number of units in the length by the number of units in the breadth...
Page 43 - At 8 cents a pound, how many pounds of sugar can be bought for 48 cents ? For 50 cents ? For 58 cents ? For 62 cents ? For 64 cents ? 29.
Page 68 - ... 291. MAGNITUDES WHICH ARE INVERSELY PROPORTIONAL TO OTHER MAGNITUDES OR TO THE SQUARES OF OTHER MAGNITUDES. EXAMPLE. If 5 men do a piece of work in 16 days, how long will it take 8 men to do a similar piece of work ? OPERATION AND EXPLANATION. It is evident that the time required will be inversely proportional to the number of men employed ; that is, if twice as many men are employed, not twice as much, but \$ as much time will be required.
Page 58 - What will five barrels of flour cost, at six dollars a barrel ? 25. If a man can travel four miles in an hour, how far can he travel in eight hours 1 26. If it take four bushels of wheat to make a barrel of flour, how many bushels will it take to make seven barrels ? B.