Tham khảo tài liệu 'theatex as higher education assessment_4', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | THEA MATH REVIEW Integers include the whole numbers and their opposites. Remember the opposite of zero is zero . .-3 -2 -1 0 1 2 3 . Rational numbers are all numbers that can be written as fractions where the numerator and denominator are both integers but the denominator is not zero. For example 2 is a rational number as is -ịp The 3 decimal form of these numbers is either a terminating ending decimal such as the decimal form of 4 which is or a repeating decimal such as the decimal form of 1 which is . Irrational numbers are numbers that cannot be expressed as terminating or repeating decimals . nonrepeating non-terminating decimals such as n V2 V12 . The number line is a graphical representation of the order of numbers. As you move to the right the value increases. As you move to the left the value decreases. Greater Than ---------- ----------- -------------------------1------------------------ -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 ------ --------------- Less Than If we need a number line to reflect certain rational or irrational numbers we can estimate where they should be. -4 V2 I I I I pi-1 I -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Comparison Symbols The following table will illustrate some comparison symbols is equal to 5 5 is not equal to 4 3 is greater than 5 3 is greater than or equal to x 5 x can be 5 or any number 5 is less than 4 6 is less than or equal to x 3 x can be 3 or any number 3 84 THEA MATH REVIEW Symbols of Addition In addition the numbers being added are called addends. The result is called a sum. The symbol for addition is called a plus sign. In the following example 4 and 5 are addends and 9 is the sum 4 5 9 Symbols of Subtraction In subtraction the number being subtracted is called the subtrahend. The number being subtracted FROM is called the minuend. The answer to a subtraction problem is called a difference. The symbol for subtraction is called a minus sign. In the following example 15 is the minuend 4 is the subtrahend and 11
