Adding Integers Absent Copy

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Presentation transcript:

Adding Integers Absent Copy 10/1,2

Example 1 -2 Add: 1. 5 + (-7) 7 – 5 = 2 Solution Solution 1. 5 + (-7) 7 – 5 = 2 Sign of larger # is neg. so -2 Solution Solution What is a integer? Think of last class Any negative or positive whole #. What is the rule when you are adding integers w/ dif. Signs? When we have different signs we subtract and give the sign of the larger #. -2

Example 2 Add: 2. -4 + 8 8 – 4 = 4 Sign of larger # is Pos. so 4 Solution What is the rule when you are adding integers w/ dif. Signs? When we have different signs we subtract and give the sign of the larger #. 4

Example 3 Find the sum: 3. -8 + (-13) 8 + 13 = 21 Since the #’s both have a neg. sign we add the #’s and give the answer a neg. -21 Solution What is the rule when you are adding integers and the signs are the same? When the signs are the same we keep the sign they both have add the numbers. -21

Example 4 -22 Evaluate the expression and find the sum: Why is this an Expression? Because it does not have an = sign. What is the first step in this problem? To substitute -8 for r What is the rule when adding integers and the signs are the same? When the signs are the same we keep the sign they both have add the numbers. Evaluate the expression and find the sum: 4. -14 + r for r = -8 -14 + -8 14 + 8 = 22 Since the #’s both have a neg. sign we add the #’s and give the answer a neg. -22 Solution -22

Example 5 4 Evaluate the expression and find the sum: 5. x + y for x = 18, y = -14 18 + -14 18 – 14 = 4 Sign of larger # is Pos. so 4 Solution What is the first step in this problem? To substitute 18 for x and -14 for y What is the rule when adding integers and the signs are Different? When we have different signs we subtract and give the sign of the larger #. 4

Change in temp. is 8 degrees Example 6 Solve the problem: 6. The temperature gauge at the Greater Cincinnati International Airport reads 23º F. The temperature changes to 15º F. What is the change in temperature? 23 + (-15) = 8 Solution Write and expression using 2 integers we can add to get 15º F. Change in temp. is 8 degrees