Review of Introductory Mathematics FOUR BASIC ARITHMETIC OPERATIONSNumbers in the decimal system may be classified as integers or fractions. An integer is a wholenumber such as 1, 2, 3, . . . 10, 11, . . . A fraction is a part of a whole number, and it isexpressed as a ratio of integers, such as 1/2, 1/4, or 2/3.An even integer is an integer which can be exactly divided by 2, such as 4, 16, and 30. All otherintegers are called odd, such as 3, 7, and 15. A number can be determined to be either odd oreven by noting the digit in the units place position. If this digit is even, then the number is even;if it is odd, then the number is odd. Numbers which end in 0, 2, 4, 6, 8 are even, and numbersending in 1, 3, 5, 7, 9 are odd. Zero (0) is even.Examples:Determine whether the following numbers are odd or even: 364, 1068, and 257.Solution:1. 364 is even because the right-most digit, 4, is an even number.2. 1068 is even because the right-most digit, 8, is an even number.3. 257 is odd because the right-most digit, 7, is an odd number.AddingWholeNumbersWhen numbers are added, the result is called the sum. The numbers added are called addends.Addition is indicated by the plus sign (+). To further explain the concept of addition, we willuse a number line to graphically represent the addition of two numbers.Example: Add the whole numbers 2 and 3.Solution: Using a line divided into equal segments we can graphically show this addition.Rev. 0 Page 7 MA-01

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