Do Now Solve (-51) = (-47) = = 12 + (-42) =

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Presentation transcript:

Do Now Solve -30 + (-51) = -34 + (-47) = -36 + 15 = 12 + (-42) = 120 + (-36) = -3 + 45 = 27 + (-42) = 25 + 45 = -25 + 45 = 47 + (-9) = -44 + 16 = 4 + (-26) = -40 + (-5) = 41 + (-4) =

Do Now Solve 25 + 45 = 70 -25 + 45 = 20 47 + (-9) = 38 -44 + 16 = -28 4 + (-26) = -22 -40 + (-5) = -45 41 + (-4) = 37 -30 + (-51) = -81 -34 + (-47) = -81 -36 + 15 = -21 12 + (-42) = -30 120 + (-36) = 84 -3 + 45 = 42 27 + (-42) = -15

Subtracting Integers When subtracting: Find the ADDITIVE INVERSE of the second integer Then solve as an addition problem

Subtracting Integers When subtracting: What is additive inverse? Find the ADDITIVE INVERSE of the second integer Then solve as an addition problem What is additive inverse? It’s simply the opposite of a number

Subtracting Integers How do we find the additive inverse? Ex. -14 – 21 =

Subtracting Integers How do we find the additive inverse? Ex. -14 – 21 = Change the subtraction sign to an addition sign -14 + 21 =

Subtracting Integers How do we find the additive inverse? Ex. -14 – 21 = Change the subtraction sign to an addition sign -14 + 21 = Take the opposite of the second integer -14 + (-21) = -35

Subtracting Integers Try finding the additive inverse first: Ex. 20 – 25 = Ex. 16 – (-13) = Ex. -21 – 14 = Ex. -30 – (-4) =

Subtracting Integers Try finding the additive inverse first: Ex. 20 – 25 = 20 + (-25) = -5 Ex. 16 – (-13) = Ex. -21 – 14 = Ex. -30 – (-4) =

Subtracting Integers Try finding the additive inverse first: Ex. 20 – 25 = 20 + (-25) = -5 Ex. 16 – (-13) = 16 + (+13) = 29 Ex. -21 – 14 = Ex. -30 – (-4) =

Subtracting Integers Try finding the additive inverse first: Ex. 20 – 25 = 20 + (-25) = -5 Ex. 16 – (-13) = 16 + (+13) = 29 Ex. -21 – 14 = -21 + (-14) = -35 Ex. -30 – (-4) =

Subtracting Integers Try finding the additive inverse first: Ex. 20 – 25 = 20 + (-25) = -5 Ex. 16 – (-13) = 16 + (+13) = 29 Ex. -21 – 14 = -21 + (-14) = -35 Ex. -30 – (-4) = -30 + (+4) = -26