1. The following is taken at random. Divide 1883 by 365.

_First._ The divisor, since it ends in 5, must be multiplied by 2,

giving 730. Dropping the O, we have 73 for the prepared divisor.

_Second._ The last figure of the prepared divisor being 3, this is the

extraneous multiplier. Multiplying the truncated divisor, 7, by the

extraneous multiplier, 3, and adding 1, we have 22 for the current

multiplier.

_Third._ The dividend, 1883, has now to be multiplied by the product

of 3, the extraneous multiplier, and 2, the multiplier used in

preparing the divisor. The product, 11298, is the prepared dividend.

_Fourth._ From the prepared dividend, 11298, we cut off the last

figure 8, and multiply this by the current multiplier, 22. The

product, 176, is added to the truncated dividend, 1129, and gives 1305

for the first modified divisor. The whole operation is shown thus:

1 8 8 3

6

-------

1 1 2 9|8

1 7 6 -

-----

1 3 0|5

1 1 0 -

-----

2|4 0

8 8 ---

---

|9 0

-----

1 9|8

1 7 6 -

-----

1 9|5

1 1 0 -

-----

1 2|9

1 9 8 -

-----

2|1 0

2 2 ---

2 4

We stop at this point because 24 was a previous modified dividend,

written under the form 240 above. Our two infinite numbers (which need

not in practice be written down) are, with their difference:

. .

10,958,904,058 . .

10,958,904,109.5890410958904

----------------------------

. .

51.5890410958904

. .

Hence the quotient sought is 5.158904109.

_Example 2._ Find the reciprocal of 333667.

The whole work is here given:

3 3 3 6 6|7 |7

2 3 3 5 6 7 - 1 6 3 4 9 6|9

2 1 0 2 1 0 3 -

-------------

2 2 6 5 5 9|9

2 1 0 2 1 0 3 -

-------------

2 3 2 8 6 6|2

4 6 7 1 3 4 -

-----------

7 0 0 0 0 0

. .

_Answer_, 0.000002997.

_Example 3._ Find the reciprocal of 41.

_Solution._--

4|1 |9

----- -----

3 7|9 3 3|3

- 1 1 1 -

-----

1 4|4

1 4 8 -

-----

1 6|2

7 4 -

---

9 0

. .

_Answer_, 0.02439.

Scientific American Supplement, No. 421, January 26, 1884 · 第 42 / 48 题