Whiteboard Protocol Sign Numbers Bell Work Find the
Whiteboard Protocol Sign Numbers � � � Bell Work Find the sum. 1. ) 4 + 2 2. ) 27 + 32 OBJECTIVE: � TLW add real numbers using the rule. � CLASSWORK: Simplify. 1. ) 5. 2 + (-9, 6) 2. 4 + (-8. 7) + 3. 6 3. ) (-2/3) + (4/6) � EXIT TICKET: Simplify the expressions on the last slide. www. msphyllisbuehler. weebly. com 12/16/2021 1
Bell work Answers � 1. ) 4 + 12 = 16 � � � 2. ) 27 + 32 = 59 www. msphyllisbuehler. weebly. com 12/16/2021 2
Rules for Sign Numbers Rule 1: Adding Number With the Same Sign � To add two numbers with the same sign, add their absolute values. The answer has the same sign as the numbers Rule 2: Adding Numbers With Different Signs To add two numbers with different signs, find the difference of their absolute values. The sum has the same sign as the addend with the greater absolute value. (Prentice Hall Algebra I-2006 -green) www. msphyllisbuehler. weebly. com 12/16/2021 3
Example 1 Simplify: 1. ) 2 + 6 = 8 2. ) -2 -7 = -9 � If you notice, both numbers have the same sign. Add both numbers, and answer has the same sign as the numbers. www. msphyllisbuehler. weebly. com 12/16/2021 4
Example 2 Simplify : -8 + 10 = x 8 – 27 = y Answer: -8 + 10 = x Different signs, subtract the smaller number from the larger number and give the answer the sign of the larger number 2 = x Answer www. msphyllisbuehler. weebly. com 12/16/2021 5
Multiplication of Sign Numbers Rule 1: Multiplying numbers with the same sign, the sign of the answer will be positive 3(4) = 12 3 • 4 = 12 -2(-7) = 14 -2 • -7 = 14 Rule 2: Multiplying numbers with different signs, the sign of the answer will be negative. 3(-4) = -12 -3(4) = -12 3 • -4 = -12 -3 • 4 Rule 3: When multiplying numbers with different sign, the answer will have a negative sign. www. msphyllisbuehler. weebly. com 12/16/2021 6
Practice Simplify: 1. ) 40 -23 2. ) -80 - 41 3. ) 15 – 14 4. ) 15 + 24 5. ) -16 + 27 Answer: 1. ) 17 2. ) -121 3. ) 1 4. ) 39 5. ) 11 www. msphyllisbuehler. weebly. com 12/16/2021 7
Summative Assessment Simplify. Turn in your answers at the end of the class period. 1. ) 2. ) 3. ) 4. ) 5. ) 6. ) 7. ) � -27 + 19 5 -9 -2. 3 + 4. 5 -8. 05 + 7. 4 9. 51 – 17 45 – 87 -2. 3 + 4. 5 http: //msphyllisbuehler. weebly www. msphyllisbuehler. weebly. com 12/16/2021 8
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