## A Mental Arithmetic |

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12 cents 25 cents 50 cents 9 dollars acres annum apples barrels of flour bill blackberries bought boy receive bushel cake cent must $100 cents a dozen cents a pound cents a quart cents a yard coal cost containing cords of wood costing $1 cows cubic feet cubic foot earn eggs eighths feet long feet wide foot of water fraction Frank pick gallons gave half-dollars horse improper fraction inches investment Lesson loss marbles miles an hour miles per hour months one-half oranges paid peaches pears peck pennyweight pint postage stamps pounds of sugar premium quarts of berries quotient rate of profit rate per cent rectangle remainder schooner sheep sixths specific gravity spend square feet temperature terest to gain tons of coal trees TROY WEIGHT twelfths vessel walk water weighs 1000 week weighs 1000 ounces worth

### Popular passages

Page 56 - Dry Measure 2 pints (pt.) =1 quart (qt.) 8 quarts = 1 peck (pk.) 4 pecks = 1 bushel (bu.) 2150.42 cu.

Page 63 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30| square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq.

Page 67 - TIME 60 seconds (sec.) = 1 minute (min.) 60 minutes =1 hour (hr.) 24...

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 - Long Measure is used in measuring lines or distances. TABLE. 12 inches (in.) = 1 foot (ft.). 3 feet = 1 yard (yd.). 5| yards, or 16| feet = 1 rod (rd.).

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 112 - If 2 men start from the same place and travel in opposite directions, one at the rate of 4 miles an hour, and the other at the rate of 5 miles an hour, how far apart will they be at the end of 1 hour ? At the end of 2 hours ? 5 hours?

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.