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ii

The following explanations and table, not being contained in the Written Arithmetic, are inserted here for the convenience of those who have not studied Mental Arithmetic, Equality is expressed by two horizontal marks; thus 100 cts,

=1 dollar, signifies that 100 cents are equal to onc dollar. +Addition is denoted by a cross, formed by one horizontal and

one perpendicular line, placed between the number; as 4+5

=), signifying that 4 added to 5 equals 9. * Multiplcation is denoted by a cross, formed by two oblique

lines placed between the numbers: as 5x3=15, signifying that

5 multiplied by 3, or 3 times 5 are equal to 15. Subtraction is denoted by one horizontal mark, placed between

the numbers; as 7–433, signifying that 4 taken from 7 leavc 3. 26,+ or Division is denoted three different ways; 1st by the reversed parenthesis; 2ndly, by a horizontal line placed between the numbers with a dot on each side of it; and 3dly, by writing the number to be divided over the other in the form os a fraction; thus 2)6(3, and 6+2=3 and =3, all signify the game thing, namely, that if 6 be divided by the quoticni is 3,

MULTIPLICATION AND DIVISION TABLE.

11 21 31 41 51 61 71 81 9 10 11 12
21 41 61 81 10 12 14 16 18 20 22 24
31 61 91 12|15| 181 211 241 271 301 33 36
41 81 121 161 20 241 28 32 36 40 441 48
5/ 10 15 20 25 30 35 40 45 50 55 60
6| 12| 18 24 301 301 42| 48 54 60 661 72
7| 141 211 281 351 42| 491 561 631 701 771 84
8161 241 32| 40| 481 561 64 72 801 881 96
91 18] 271 361 451 541 631 72 81 901 99 100
101 201 30 40 50 60 70 80 90 100 110 120
111 22 331 441 55) 661 771 881 991110|121|132
12 24 36 48 601 721 84|96|108|120132|144

Entered according to Act of Congress, in the year one thousand eight hundred and twenty eight, by ZADOCK THOMPSON, in the Clerk's Office of the District of Vermont.

HARVAR, GOLLERE UMAN

GIFT OF THE
GRADUATE SCHOOL OF EDUCATION

HAY 19 1926

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