MATHEMATICS FOUR FUNDAMENTAL OPERATIONS MAIN POINTS Positive integers:+1,+2,+3,+4...…. Whole numbers;0,+1,+2,+3,+4..... Negative numbers:-1,-2,-3,-4..... Integers: …-3,-2,-1,0,+1,+2,+3.... Rational numbers : The group(set) of numbers containing all the integers and fractions. Counting numbers; Positive integers or whole numbers except zero. Absolute value: The value of its magnitude without sign of a number. Laws of addition: When the numbers are of the same sign, find the sum of their magnitudes and put the common sign. When the numbers are opposite in sign, find the difference of their magnitudes and put the sign of the number with greater magnitude. Additive inverse: When the sum of the two numbers is zero, each number is called the additive inverse of the other. Subtraction: If we subtract a number from another number, we add the additive inverse of the subtracting number to the first number.in short, to subtract, add the additiv