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1. Name the periods in order from units to quadrillions. 2. Name the places in order from units to quadrillions.

Name the following periods:

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Write in figures—

44. Fifty-six thousand, four hundred.

45. Four million, two hundred and sixteen thousand, and one.

46. Forty million, forty thousand, and forty.

47. Six billion, six million, six thousand, and six.

48. Nine hundred and forty million, eight hundred and six thousand, four hundred and six.

49. Seven trillion, six billion, five million, four thousand, and three.

7. The table which has been given will enable us to read a number consisting of eighteen figures: the periods which follow them are

Quintillions, Sextillions, Septillions, Octillions, Nonillions, Decillions, Undecillions, Duodecillions, etc.


8. In this system seven letters are used to express numbers. Thus,


L, C, D, M, 1. 5. 10. 50. 100. 500. 1000.


Other numbers are expressed by writing two or more of these letters side by side.

(1) When a letter is repeated its value is repeated; thus, II represents 2; XXX, 30; CCCC, 400, etc.

(2) When a letter is placed before one of greater value, their Difference is expressed; thus, IV represents 4; XL, 40; XC, 90, etc.

(3) When a letter is placed after one of greater value, their Sum is expressed; thus, VI represents 6; XV, 15; LX, 60,


(4) A dash placed over a letter increases its value a thousand fold; thus, V represents 5000; VII, 7000; XI, 11000, etc.

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9. In the currency of the United States one hundred cents make a dollar.

The sign $, called the Dollar Sign, is written before the number. Thus, one dollar is written $1, or $1.00; and fifteen dollars and twenty-five cents is written $15.25. The period between the dollars and cents is called the decimal point. Cents occupy the first two places at the right of the decimal point.

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13. Five dollars. Fifty dollars. Five hundred dollars.

14. Four dollars and 25 cents.

15. One hundred and forty-seven dollars and thirty-seven cents.

16. Six hundred and twenty dollars and nine cents. 17. Three thousand and ten dollars and fifty cents.


10. A Unit is one of any kind.

A Number is a unit or a collection of units, or rather the "how many" of the collection.

Arithmetic treats of numbers and their uses.

11. There are three ways of expressing numbers: 1. By words; as, one, two, three, etc.

2. By letters, called the Roman method; as, I, II, III, etc. 3. By figures, called the Arabic method; as, 1, 2, 3, etc.

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