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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
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
HAY 19 1926