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Transcript
6.3 Integers Pg Numbers get smaller Numbers get larger Key words positive- gain, above, increase, ahead, deposit, elevation Key words negative- loss, below, decrease Ordering and comparing integersMake a number line and graph the integers on the number line! Easy! Practice- Order from least to greatest (set table) 2, -5, 3, 0, -2 NOW….order them greatest to least (you just go backwards!) Okay, now let’s add and subtract integers (7.5) Use a number line to help. All you do is pay attention to just the sign of the integer. No sign means it is positive. 1. -5 + -7= -12 same as -5-7= -12 2. 6 + -10= -4 same as 6 – 10= 4 3. I-7I – I-5I= 2 absolute value 7 – 5 = 2 6.3 Vocabulary pg integers The set of whole numbers and their opposites (…-3, -2, -1, 0, 1, 2, 3…). positive integer An integer that is greater than zero; it is located to the right of zero on a number line. negative integer An integer that is less than zero; it is located to the left of zero on a number line. whole number A number that has no decimal or fraction. Examples: 6, 10, and 1 opposite The opposite of a given integer can be found by adding or taking away a negative sign (-). For example, the opposite of -13 is 13, and the opposite of -8 is +8. absolute value On a number line it is the distance between the number and zero. Uses l l symbol. Ex-symbol for absolute value |-20| = 20 and read "The absolute value of -20 equals 20". Pg PRACTICE Put the integers in order from least to greatest. 1. 8, 3, -6, 6, 11, -8 pg Remember- use a number line to place integers in order. But pay careful attention to which direction is asked for. 2. -31, -20, 32, 63, l-58l Set your table and you will have it in the correct order. Order from greatest to least -2, 0, 4, -3, 1 3. 56, -45, l-16l , -19, -55, 10 _____ _____ L _____ _____ ______ G