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INTRODUCTION TO ARITHMETIC,

PART VIII.

CONTAINING,

༡་ ༤

REDUCTION OF WEIGHTS AND MEASURES,
DUODECIMALS, REGULATIONS OF OLD
LINES, AND THE METHOD OF
MAKING NATURAL RADIUS.

REDUCTION.

KEY TO CARD No. 28.

THIS Rule is used in reducing large denominations to small ones, as, pounds to shillings, pence, &c. called Reduction descending, or in reducing small denominations to large ones, as, farthings to pence, shillings, &c. called Reduction ascending; but these niceties are unworthy the attention of men in business: The main thing is to understand how to calculate with accuracy and despatch.*

We shall therefore attend to such lessons as will most probably happen in the common business of life; and study out those of amusement, when time, circumstances, and propriety will admit.

AVOIRDUPOIS WEIGHT.

16 drams, marked dr. make 1 ounce,

16 ounces make 1 pound,

28 pounds 1 quarter of a hundred weight,

Oz.

lb.

qr.

cwt.

20 hundred weight 1 ton,

T.

60 pounds 1 bushel of wheat in New-York,

B.

4 quarters, or 112 lb. 1 hundred weight,

• Despatch is more modern than dispatch.

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KEY TO CARD No. 28.

LESSON 1.

DIRECTIONS.

2. Multiply this sum by 28,

In 1440 lb. of wheat, how the number of pounds in a many bushels? Ans. 24 B.quarter, and add the 25 lb. of the given sum, which will make for an answer, 1649 lb. 14x4+2=58. 58×28+25=1649. Read thus:

1440÷60-24 for an answer.
That is, 1440 divided by
60 équals 24 for an answer.
6|0)1440

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14 multiplied by 4 added to 2 equals 58.

58 multiplied by 28 added to 25 equals 1649.

OPERATION.

cwt. grs. lb.
14 2 25

4

58

28

489

1235 lb.

116

1245

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1231

1649

1242

6(0)49513

Bring 1649 pounds into

LESSON 5.

82 33 lb. hundreds, quarters, and

How many pounds and bush-pounds. els in the whole?

Answer, 4953 lb. or 82

B. 33 lb. over.

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