Warmup 1.6 Find the sum: (-32) (-16) + (-12)

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Presentation transcript:

Warmup 1.6 Find the sum: -14 + (-32) -8 + 22 27 + (-16) + (-12) Find the difference 5.7 – 3.2 5) 6.5 – 5.88

Objective: Subtract integers Section 1.6 Objective: Subtract integers

Vocabulary Yeah, No new vocabulary today 

Rule for Subtracting Integers ADD the opposite! “K F C” Keep the first number Flip subtraction to addition Change the second number to its opposite EVERY time you see subtraction…Change it to Addition!!!

Example 1 4 – 10 7 – (-5) -2 – (-9) K F C 4 + (-10) = -6 K F C 7 + 5 Different signs Subtract, sign of larger K F C 7 + 5 =12 Same sign Add, keep sign K F C -2 + 9 = 7 Different signs Subtract, sign of larger

Example 2 Evaluate the expression when x = -9 x – (-40) 7 - x = -9 – (-40) K F C Different signs Subtract, sign of larger -9 + 40 = 31 = 7 – (-9) K F C Same signs Add, keep sign 7 + 9 = 16

Your turn Find the difference Evaluate when y = -14

Evaluating Change Use subtraction to find the change in a quantity Examples: Elevation, temperature Change = Final – Original “CFO”

Example 3 Find the change in temperature from -15°C to 10°C Change = Final – Original = 10 - (-15) K F C = 10 + 15 = 25°C

Your turn Find the change in temperature From 32°F to -10°F From 8°C to -3°C From -2°C to 15°C

Pre Alg. Classwork 1.6 Find the difference Evaluate the expression when m = -6 9)Find the change in temperature from -5°F to -13°F

Closure Identify the mistake & fix the mistake: -5 – 7 K F C 5 + (7) Step 1 K F C 5 + (7) Step 2 Step 3 12