SECTION 1-5 : ADDING and SUBTRACTING REAL NUMBERS

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SECTION 1-5 : ADDING and SUBTRACTING REAL NUMBERS

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Presentation transcript:

SECTION 1-5 : ADDING and SUBTRACTING REAL NUMBERS ALGEBRA I @ SECTION 1-5 : ADDING and SUBTRACTING REAL NUMBERS

At the end of this lesson you should be able to find the sums and differences of Real Numbers.

ADDITION RULES Examples…. SAME SIGNS DIFFERENT SIGNS Keep signs Use sign of larger Add number Subtract Examples….

SUBTRACTION RULE Add the opposite or Keep – Change - Change Examples…

Find each sum or difference. 1) 34 + (-23) ANSWER : 11 2) -12 + (-39) ANSWER : -51 3) -17 – 25 ANSWER : -42 4) -17.6 – 2.9 ANSWER : -20.5 5) -14.7 – (-22.9) ANSWER : 8.2

6) -0.8 + 5.6 – 3.2 + 4 ANSWER : 5.6 ANSWER : -1/2 ANSWER : 23/18 ANSWER : 3 19/28

ALGEBRA I - SECTION 1-5 (Adding and Subtracting Real Numbers) 10) Evaluate if a = -5.6 and b = -4.7. a - b ANSWER : -0.9 ANSWER : -1/35

12) John is the running back for Doh High School 12) John is the running back for Doh High School. He had the following runs in the last football game : gain 4 yards, lost 3 yards, gain 16 yards, gain 3 yards, no gain, lost 5 yards, gain 8 yards, gain 22 yards, lost 3 yards. What is John’s total yards for the game? ANSWER : +42 yards

As you can see, John is #1 in math also.