Adding Integers. How do I add integers if the signs are the same? How do I add integers if the signs are the same? Examples: Examples: 1. r = 23 + 34.

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Presentation transcript:

Adding Integers

How do I add integers if the signs are the same? How do I add integers if the signs are the same? Examples: Examples: 1. r = s = (-3) = q = t IF THE SIGNS ARE THE SAME IF THE SIGNS ARE THE SAME Add the integers Sign of the bigger number! r = 57 s = = q +18 = t

How do I add integers if the signs are different? How do I add integers if the signs are different?Examples 1. f = (-17) m = 52 + (-60) (-3) = s 4. g = 3 + (-8) IF THE SIGNS ARE DIFFERENT: IF THE SIGNS ARE DIFFERENT: Subtract Take the sign of the bigger number! f = 3 m = -8 3 = s g = -5

When solving an equation, look inside See if positives and negatives are side by side. If this is the situation that exists, Then the rules for add’n subtract take on a new twist. If the operation sign in the middle is a plus, Then look at the signs on the numbers it really is a must.

Chorus:Same-AddDifferent-Subtract Take the sign of the bigger number. Same-AddDifferent-Subtract

More examples 1. m = m = d = d = w = -4 + (-3) w = b = 5 + (-2) b = 3 5. d = d = 0

Adding Integer Rules Same signs – add and take the sign of the bigger number Same signs – add and take the sign of the bigger number ex: = 13 ex: = - 13 Different signs – subtract and take the sign of Different signs – subtract and take the sign of the bigger number the bigger number ex: = - 3 ex: = 5

Let’s get started on our assignment! “Sum Up” Worksheet – I hope you were paying attention!!! It’s time to test your knowledge......

Adding Integers Adding Integers How can I use a number line to model addition of integers? How can I use a number line to model addition of integers? Graph the first integer Graph the first integer Move the point to the ________ if the second integer is positive. Move the point to the ________ if the second integer is positive. Move the point to the ________ if the second integer is negative. Move the point to the ________ if the second integer is negative.

Example: = ? Example: = ? Graph your point at -7 Graph your point at -7 Move to the _____ because the second integer is negative. Move to the _____ because the second integer is negative. The point is now at _____. The point is now at _____.