A Mental Arithmetic

12 days 12 leaves 30 days 9 leaves acres apples bill brokerage bushels called centilitres centimetres cents apiece common denominator contained cord cost cubic currency decagrams decimetre dimes dollars dozen drams dry measure equal feet Find the amount Find the interest five-twenties flock fourths fraction gallon gold grains half halves hectolitres hectometre horse Improper Fraction inches invested kilogram least common denominator leaves 9 litre lower denominations lowest terms MENTAL ARITHMETIC metre Metric System miles an hour minutes MODEL months Multiply ninths NOTE oranges ounce paid past 12 pear pennyweight person bought pine-apple present worth principal profit quart receive Reduce rods SECTION sells shares sheep sixths sold square steres subtract taining tenths third tonneau trees Troy Weight true discount twice units weeks Weight whole yards yield