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Title: How to become a lightning calculator

Author: Anonymous

Release date: April 13, 2021 [eBook #65078]
Most recently updated: October 18, 2024

Language: English

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*** START OF THE PROJECT GUTENBERG EBOOK HOW TO
BECOME A LIGHTNING CALCULATOR ***

CONTENTS
Instantaneous Addition.
How to Add Two Columns at Once.
Multiplication.
Accurate Interest.
Equation of Payments.
The Lightning Calculator’s Addition.
Bank Discount.
How to Make Change.
Proof of Multiplication in Ten Seconds.
The Canadian Interest Rule.
Table of Transposed Numbers.
Short Method to Find the Interest of a Given Sum.
Interest Computations.

Multum in Parvo
Library.

February, 1894.
Vol. I. Published Monthly.
No. 2.

How to Become a

LIGHTNING
CALCULATOR.
Smallest Magazine in the World. Subscription
price, 50 cts. per year. Single copies, 5 cents each.

PUBLISHED BY
A. B. COURTNEY,
671 Tremont Street, Boston.

Entered at Post-Office as second-class matter.

Instantaneous Addition.
Accuracy should be first considered, then rapidity. Quick adders, by the
way, are the most accurate. Write the numbers in vertical lines, avoiding
irregularity. This is important. Keep your thought on results not numbers
themselves. Do not reckon 7 and 4 are 11 and 8 are 19, but say 7, 11, 19 and
so on.
When the same number is repeated several times, multiply instead of
adding.
When adding horizontally begin at the left.
In adding long columns, prove the work, by adding each
3132 column separately in the opposite direction, before
2453 12 adding the next column. Many accountants put down
6471 20 both figures as in the illustration. The sum of the first
7312 15 column is 12; carrying one, the sum of the second is 20;
2134 21 carrying two, the sum of the third column is 15; carrying
one, the sum of the fourth column is 21, and the total,
21502
21502, is found by calling off the last two figures and the
right-hand figures, following the wave line in the
illustration. This method is better than the old one of
penciling down the number to carry. If one desires to go back and add a
certain column a second time, the number to carry is at hand and the former
total is known.

How to Add Two Columns at Once.
2312 To the inexperienced it will be a difficult task to add two columns
3253 at once, but many of those who have daily practice in addition find
2610 it about as easy to add two columns as one. Say 99 and 50 are 149,
1256 and 6 are 155, and 10 and 50 are 215 and 3 are 218, and 12 are
230. Carry 2, and say 33 and 12 are 45, and 20 are 65, and 6 are
3199
71, and 30 are 101, and 2 are 103, and 23 are 126.
12630
Much of the information here contained is compiled from W. D.
Rowland’s valuable little volume, entitled “How to become expert
with figures.” You can get this handy book by sending 25 cents in stamps to
American Nation Co., Boston.

Multiplication.
To Multiply Any Number by 11.

Write the first right-hand figure, add the first and second, the second and
third, and so on; then write the left-hand figure. Carry when necessary.
219434 × 11 = 2413774
Put down the right-hand figure 4. Then say, 4 and 3 are 7; then, 3 and 4 are
7; then, 4 and 9 are 13, put down 3 and carry 1; then, 9 and 1 and 1 are 11,
put down the 1 and carry 1; then, 1 and 2 and 1 are 4; then write the left-
hand figure 2. In multiplying small numbers, such as 24 by 11, write the
sum of the two figures between the two figures, making 264, the required
product.

To Multiply by 101, 1001, etc.

To multiply by 101, add two ciphers to the multiplicand, and add to this the
multiplicand.
2341 × 101 = 234100 + 2341
To multiply by 1001, add three ciphers to the multiplicand, and add to this
the multiplicand.

To Multiply by 5, 25, 125.

To multiply by 5, add a cipher and divide by 2.
To multiply by 25, add two ciphers and divide by 4.
To multiply by 125, add three ciphers and divide by 8.

Another Easy Way to Multiply.

To multiply two figures by two figures, proceed as follows: Multiply units
by units for the first figure.

82 Carry and multiply tens by units and units by tens, (adding) for the
54 second figure. Carry and multiply tens by tens for the remaining
4428 figure or figures. In this example proceed as follows:
2 × 4 = 8 = 1st figure.
(4 × 8) + (5 × 2) = 42. Therefore 2 = 2d figure.
(5 × 8) + 4 carried = 44 = 3d and 4th figures.
By a little practice any one may become as familiar with this rule and as
ready in its application as with the ordinary method.
To multiply any number by 2 1/2, add one cipher, and divide by 4.
To multiply any number by 3 1/3, add one cipher, and divide by 3.
To multiply by 33 1/3, add two ciphers, and divide by 3.
To multiply any number by 1 3/7, add one cipher, and divide by 7.
To multiply by 16 2/3, add two ciphers, and divide by 6.
To multiply by 14 2/7, add two ciphers, and divide by 7.
To multiply by 875, add three ciphers, and divide by 8.
To divide by 25, multiply by 4, and cut off two figures.
To divide by 125, multiply by 8, and cut off three figures.
To multiply by 12 1/2, add two ciphers, and divide by 8.
To find the value of any number of articles at 75 cents each, deduct one-
quarter of the number from itself and call the remainder dollars.

To Subtract Any Number Consisting of Two Figures from 100.

Take the first figure from 9, and the second from 10. For example: in
subtracting 73 from 100, or in taking 73 cents change out of a dollar, say 7
from 9 and 2, and 3 from 10 and 7, or 27 cents. Practice this rule. It is
simple, and will be found particularly helpful in making change.

Divisions.

A number is divisible by 2 when the last digit is even.

A number is divisible by 4 when the last two digits are divisible by 4.
To divide by 12 1/2, multiply by 8, and cut off two figures.

Simple Discount Rule.

This simple rule is in use in many houses where several discounts are
allowed from list prices. Suppose the list price of a piano to be $500, and
you allow an agent 25, 20 and 10 off.
100 100 100
25 20 10
75 × 80 × 90 = .540000
Subtract each from 100 and multiply and you get .54. $500 × .54 = $270,
the agent’s price.

If you want to get a complete book on quick calculating, comprising all
modern methods, together with a vast amount of other valuable matter,
pertaining to business, send 25 cents to American Nation Co., Boston,
Mass., for a volume of “How to Become Expert at Figures.”

Percentage.

The name percentage is applied to certain arithmetical exercises in which
100 is used as the basis of computation. Per cent. is an abbreviation of the
Latin per centum, meaning by the hundred. This sign % is used for the
words per cent. Thus, 10% of a number equals 10/100, or 1/10 of the number;
50% equals 50/100, or 1/2, etc.
FRACTIONAL EQUIVALENTS.
50 % = .50 = 1/2.
33 1/3 % = .33 1/3 = 1/3.
25 % = .25 = 1/4.
20 % = .20 = 1/5.

16 2/3 % = .16 2/3 = 1/6.
12 1/2 % = .12 1/2 = 1/8.
10 % = .10 = 1/10.
8 1/3 % = .08 1/3 = 1/12.
6 1/4 % = .06 1/4 = 1/16.
5 % = .05 = 1/20.
2 1/2 % = .02 1/2 = 1/40.

Accurate Interest.
Interest is the sum charged for the use of money. It is really the use of
money or the benefit derived from its use. The principal is the sum for the
use of which interest is paid. The rate of interest is the per cent. of the
principal charged for its use for one year. Simple interest is the interest on
the principal only, for the full time; compound interest is interest on the
principal for the full time, and interest on each interest payment after it
becomes due.
To find the accurate interest on any sum of money at a given rate for one
year, multiply the sum by the rate and divide by 100.
To find the accurate interest on any sum of money at a given rate for any
given number of days, multiply the interest for one year by the number of
days and divide the product by 365.

Equation of Payments.
Equation of Payments is the process of finding when two or more sums due
at different times may be paid at once, without loss to debtor or creditor.
The time for such payment is called the equated time.
To equate two or more payments, multiply each payment by its time, and
divide the sum of the products by the sum of the payments.
The times of the several payments must be in the same denomination, and
this will be the denomination of the answer.
Less than 1/2 day is rejected; 1/2 day or more counts as 1 day. If the date is
required, reckon the equated time forward from the given date.

The Lightning Calculator’s Addition.
4379321 There are experts who can add very rapidly. The best of them,
5620679 however, cannot add up a column of ones any faster than you
2184509 can. Here is how some of the rapid addition is performed. The
7815491 operator writes a line of figures, then another, and so on. The
second line, however, added to the first makes nines, except at
2105610
the extreme right, where the two figures add to ten. The third
3453173
and fourth bear the same relation, and as many more as he
25558783 chooses to put down. The last two lines, however, are put down
at random. Now, to add these columns, he begins anywhere,
perhaps at the left-hand side, putting down 2 (the number of pairs above),
then by simply adding the two bottom lines, he gets the correct sum.

Bank Discount.
The sum charged by a bank for cashing a note or time draft is called bank
discount. This discount is the simple interest, paid in advance, for the
number of days the note has to run. Wholesale business houses usually sell
goods on time and take notes from the retailers in payment. These notes are
not often for a longer period than three months. Some are placed in the
banks for collection, others are discounted. When a note is discounted at a
bank the payee endorses it, making it payable to the bank. Both maker and
payee are then responsible to the bank for its payment. If the note is
drawing interest the discount is reckoned on and deducted from the amount
due at maturity. Most notes discounted at banks do not draw interest. The
time in bank discount is always the number of days from the date of
discounting to the date of maturity.
Example. A note of $250, dated July 7th, payable in 60 days, is discounted
July 7th, at 6 per cent.; find the proceeds.
This note is due in 63 days, or September 8th. The accurate interest of $250
for 63 days at 6 per cent. is $2.59. The proceeds, then, will be $250 - $2.59,
or $247.41.

How to Make Change.
Salesmen usually make change by addition. They have the money to count
out, and in doing so they add to the amount of the purchase until they reach
the amount of the bill presented. For example, if you buy something worth
$3.35 and present a ten-dollar bill in payment, you will probably receive in
return 5 cents, 10 cents, 50 cents, $1, and $5; the salesman saying 40, 50,
$4, $5; $10. This method is least liable to error.
Accuracy and rapidity in counting out change can best be acquired by
practice behind the counter or at the cash-desk.

Proof of Multiplication in Ten Seconds.
The unitate of a number is the sum of its digits reduced to a unit.
252 = 9
321 = 6 }= 54 = 9
252
504
756
80892 = 27 = 9
The unitate of the multiplier is 9 and the unitate of the multiplicand is 6; 6
times 9 equals 54, and the unitate of 54 is 9. Now the unitate of the product
is found to be 9 also, which is a proof of the correctness of the work.

The Canadian Interest Rule.
4 724 This rule of computing interest appears in some
181 × 11 = 19.91 Canadian text-books, and, though simply a
modification of other rules, is worthy of notice. To
find the interest on $724 for 5 1/2 months at 6 per
cent., all you have to do is to divide by 4 and multiply by 11. The rule is to
divide the principal by 4, and to multiply the quotient by one-third of the
product of the rate by the time in months. Six times 5 1/2 = 33, and one-third
of 33 is 11. If the time be expressed in years, multiply one-fifth of the
principal by one-half the product of the rate by the number of years, and
remove the decimal point one place to the left.

Table of Transposed Numbers.
DIFFERENCES.
10 21 32 43 54 65 76 87 98
9 { 01 12 23 34 45 56 67 78 89
20 31 42 53 64 75 86 97
18 { 02 13 24 35 46 57 68 79
30 41 52 63 74 85 96
27 { 03 14 25 36 47 58 69
40 51 62 73 84 95
36 { 04 15 26 37 48 59
50 61 72 83 94
45 { 05 16 27 38 49
60 71 82 93
54 { 06 17 28 39
70 81 92
63 { 07 18 29
80 91
72 { 08 19
90
81 { 09
100
90 {010
100
99 {001

Explanation of Foregoing Table.

The transposition of figures is a frequent cause of errors in proving
accounts and balance sheets. This table is founded on the fact that all
differences between transposed numbers are multiples of nine. The
difference between the figures misplaced is equal to the quotient of the
resulting error when divided by nine; thus, 91 - 19 = 72; 72 ÷ 9 = 8; 9 - 1 =

8, and the labor of searching for it may be confined to examining those
figures the transposition of which would make the difference, as they are
the only ones that can cause the error. Thus: if the error in the balance-sheet
be 81 cents, it is possibly caused by a transposition, and the clerk can first
examine the cents column of his books for items of 90 cents, or 09 cents,
alone, with a strong probability of finding the cause of the error without
further revision. Transpositions may occur in any decimal or integer place,
and the differences caused thereby are divisible by nine without a
remainder; but, beyond this table, the numbers ascend in regular
progression, each difference increasing by nine, as follows:
120 130 140
108 { 12
; 117 { 13
; 126 { 14
; etc.

The quotient of the difference in a regular progression, when divided by
nine, gives the figures transposed, thus: 130 - 13 = 117 ÷ 9 = 13, which are
the figures to be sought for when a discrepancy of 117 is shown; but this
will not apply to differences below 81, nor to mixed transpositions. An error
divisible by two may be caused by posting an item to the wrong side of the
ledger.

Short Method to Find the Interest of a Given Sum.
Reduce the time to months, and to the number thus found annex one-third
of the days, which whole number multiplied by one-half of your principal
will produce you the required interest in dollars, cents and mills, at 6 per
cent. If days only are given, multiply one-third of the days by one-half of
the principal for the required interest at 6 per cent. Note these exercises:
$250 at 6% for 8 mos. 6 ds. = 82 × 125 = $10.25.
$250 at 6% for 93 ds. = 31 × 125 = $3.88.
$250 at 6% for 9 mos. = 9 × 125 = $11.25.
In some respects this rule is superior to the well-known 60-day method of
reckoning interest.

Interest Computations.
462.50 Multiply the principal (amount of money
.48 at interest) by the time, reduced to days;
6 360 then divide this product by the quotient
obtained by dividing 360 (the number of
60 222.0000 3.70
days in the interest year) by the per cent. of
interest, and the quotient thus obtained will
be the required interest. Require the interest of $462.50 for one month and
eighteen days at 6 per cent. An interest month is 30 days; one month and 18
days equals 48 days. $462.50 multiplied by .48 gives $222.0000; 360
divided by 6 (the per cent. of interest) gives 60, and $222.0000 divided by
60 will give you the exact interest, which is $3.70. If the rate of interest in
the above example were 12 per cent., we would divide the $222.0000 by 30
(because 360 divided by 12 gives 30); if 4 per cent., we would divide by 90;
if 8 per cent., by 45; and in like manner for any other per cent.

OUR
MAIL DIRECTORY.
Every person who receives this copy of Multum in
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arrangement: We shall forward your name and address
during the next two years to many concerns, including
publishers, who will mail to you gratuitously sample
copies of publications, circulars, catalogues, etc. You
will doubtless receive a great many of such, and it
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on account of this Directory of ours.

Transcriber’s Notes:
The Table of Contents was created by the transcriber and placed in the public domain.
Use of - to represent division in some expressions is standardized to /.
The following change was made:
p. 15: Extraneous numbers were removed from the example interest computation.

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