Subtracting Integers. Subtracting Integers Subtracting Integers Let’s model integer subtraction. 4 – 2 -5 – – –

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Presentation transcript:

Subtracting Integers

Subtracting Integers Let’s model integer subtraction. 4 – 2 -5 – -2 2 4 – 2 -5 – -2 2 -3

Subtracting Integers How are we going to do this? We have to have three negatives to take away. How can we get them? 5 – -3 Add three zero pairs Do we still have 5? 5 – -3 = 8 YES! Now take away -3.

Subtracting Integers Do these: 6 – -5 = 11 -8 - 2 = -10

Subtracting Integers Go back to our battle example. What is happening in these examples? -8 – 2 = -10 6 – -5 =11 What is really happening is that I am adding the opposite each time. What is -8 + -2? -10 What is 6 + 5? 11

Subtracting Integers So, using the battle analogy, here is how we remember how to subtract. We are going to fire the cannon twice. What sound will that make? Boom! The first blast will change our subtraction sign to an addition sign. The second will change the second number to its opposite.

Subtracting Integers Let’s try one. -9 – 4 8 – 2 -9 + -4 8 + -2 = -13 8 – 2 8 + -2 = 6 12 – -5 12 + +5 = 17 -9 – 4 -9 + -4 = -13 -15 – -12 -15 + +12 = -3

Integers Song Verse 3 Here is a rule that you must know when you’re subtracting integers Add the opposite number Then follow the addition rule