Lesson 20   <br />WHAT ARE INTEGERS?<br />Objectives <br />After this lesson, the students are expected to:<br />define wh...
032 lesson 20
032 lesson 20
032 lesson 20
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032 lesson 20


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032 lesson 20

  1. 1. Lesson 20 <br />WHAT ARE INTEGERS?<br />Objectives <br />After this lesson, the students are expected to:<br />define what integers are;<br />explain the difference between positive, zero and negative integers;<br />discuss the significance of integers.<br />The Integers are natural numbers including 0 (0, 1, 2, 3, ...) and their negatives (0, −1, −2, −3, ...). They are numbers that can be written without a fractional or decimal component, and fall within the set {... −2, −1, 0, 1, 2 ...}.<br />377190092075<br />Positive integers are all the whole numbers greater than zero: 1, 2, 3, 4, 5, ... . Negative integers are all the opposites of these whole numbers: -1, -2, -3, -4, -5, … . ]Positive and Negative Integers<br />We do not consider zero to be a positive or negative number. For each positive integer, there is a negative integer, and these integers are called opposites. <br />For example, -3 is the opposite of 3, -21 is the opposite of 21, and 8 is the opposite of -8. If an integer is greater than zero, we say that its sign is positive. If an integer is less than zero, we say that its sign is negative. <br />Example: <br />Integers are useful in comparing a direction associated with certain events. Suppose I take five steps forwards: this could be viewed as a positive 5. If instead, I take 8 steps backwards, we might consider this a -8. Temperature is another way negative numbers are used. On a cold day, the temperature might be 10 degrees below zero Celsius, or -10°C. <br />The Number Line<br />The number line is a line labeled with the integers in increasing order from left to right, that extends in both directions: <br />For any two different places on the number line, the integer on the right is greater than the integer on the left. <br />Examples: <br />9 > 4, 6 > -9, -2 > -8, and 0 > -5 <br />The number of units a number is from zero on the number line. The absolute value of a number is always a positive number (or zero). We specify the absolute value of a number n by writing n in between two vertical bars: |n|. Absolute Value of an Integer <br /> Examples: |6| = 6|-12| = 12|0| = 0|1234| = 1234|-1234| = 1234<br />293444374617<br />-483577-303335WORKSHEET NO. 20<br />NAME: ___________________________________DATE: _____________ <br />YEAR & SECTION: ________________________RATING: ___________<br /> Answer the following questions correctly.<br />Which integer represents this scenario?<br />A child grows 4 inches taller.<br />-4210050417195A loss of 3 dollars.<br />4 degrees above zero.<br />2 millimeter increase in volume.<br />4 kilogram increase in mass.<br />Weight gain 5 pounds.<br />5 gram decrease in mass.<br />Weight loss of 1 pound.<br />A child grows 9 inches taller.<br />7 millimeter decrease in volume<br />