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Just think of addition and subtraction as directions on the number line. There are also several rules and properties that define how to perform these basic operations. To add integers having the same sign, keep the same sign and add the absolute value of each number. To add integers with different signs, keep the sign of the number with the largest absolute value and subtract the smallest absolute value from the largest. Subtract an integer by adding its opposite. Watch out! The negative of a negative is the opposite positive number.
Hand method: to calculate the whole number part of a/b if a and b are positive integers, subtract b from a repeatedly until the result is nonnegative but smaller than b. The number of times you subtracted is the integer part of a/b. TI-108 method: enter the following keys or numbers: a.