Subtracting Integer Lesson 1.3

Change the subtraction to addition and change the sign of the next number Instead of Subtracting…

K-Keep the first term F- Flip the subtraction to addition C-Change the sign of second term KFC

Same sign add and keep Different Sign Subtract Keep the sign of the larger number then you’ll be exact Change the minus to a plus; Change the sign of the next; All you do is add them up as if they were a plus Row Row Row Your Boat Song

Adding and Subtracting Integers

Examples:

Examples

Examples:

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White Board Activity Directions: Re-write the expression as an addition problem and then simplify – – (-12) 3.12 – – (-19) 5.23 – (-23) 1) -6 + (-4) = -10 2) = 5 3) 12 + (-16) = -4 4) = 24 5) = 46

Homework Worksheet

1.3 Day 2 Adding and Subtracting Integers

We are going to simplify problems that have both addition and subtraction Introduction Like this one: – 8 – (-4) Notice: The addition stays the same The subtraction needs to be turned into addition using KFC

Underline the numbers that can stay the same. Circle the numbers that need to be changed. Remember to include the subtraction sign. KFC the circled numbers. Add all positive integers. Add all negative integers. Lastly, add integers. Strategy

Examples: A) – 8 – (-4) KFCFC (-8) (-10)

Examples: B) 5 – 8 – – (-7) KFCFC 5+ (-8) (-17) FC + (-9)

Examples: C) -7 – 3 – (-8) – 9 KFCFC -7+ (-3) (-19) 0 FC (-9)

Examples: D) 8 – 9 – (-11) – – KFCFC 8+ (-9)+ (-4) 31 +(-14) 17 FC (-1) FC

Examples: