1.3 Adding Integers POD #1l 45 + 3l - l- w l w=3 l 45 + 3l - l-3 l *Plug it in, Plug it in 48 - 3 45 POD #2l a l + l 37 – 2 l a= 25 l 25 l + l 37 – 2 l.

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Presentation transcript:

1.3 Adding Integers POD #1l l - l- w l w=3 l l - l-3 l *Plug it in, Plug it in POD #2l a l + l 37 – 2 l a= 25 l 25 l + l 37 – 2 l *Plug it in, Plug it in Objection:Today I will learn how to add integers

1.3 Adding Integers What is an integer?Positive and negative numbers Example: 24, -47, 333, 5000, -24 How do I add integers?+/- Integer Rules Same Sign Sum (Sum= add) Different Signs take the Difference (Difference= subtract) Example: , + Different Signs take the Difference 4 Which number is bigger the 8 or 4? 8 -4 Take the sign in front of the bigger number

Evaluate (solve):-1 + (-6) Look at the signs right in front of the number -1 + (-6) -, - Same Sign Sum 7 What is the same sign? negative (-3) +, - Different Signs take the Difference 6 Which number is bigger the 9 or 3? 9 6 Take the sign of the bigger number , + Different Signs take the Difference 0

What are the additionIdentify Property of Addition properties (rules)? The “identity” of the number stays the same Example: -3 +0= -3 The “identity” starts with -3 and ends with - 3 Inverse Property of Addition The inverse sign to always give you a zero as the answer Example: 5+ (-5)= 0 The inverse of 5 is –5, the answer is 0 Closure Property of Addition The adding of integers Example: 7+ 7= 14

Name the properties: 42+ (-23)= = = = -77

What if there arePlug it in, plug it in variables?a= -13 b= 24 c= -27 a+b plug it in, plug it in -(13)+ (24) -, + Different Signs take the Difference 11 Which number is bigger the 13 or 24? Take the sign of the bigger number a+ lcl plug it in, plug it in -13+ l -27 l What is the absolute value of 24? places from zero ,+ Different Signs take the Difference 14 Which number is bigger the 13 or the 27? Take the sign of the bigger number

White Board CheckEvaluate (solve) = 30 *Different Signs Take the Difference -30 * 35 is bigger so take the sign = 106 *Same Signs Sum -106 * What is the same sign? Negative