Subtracting Integers: Key Rules and Techniques

The video tutorial explains how to subtract integers by adding their opposites. It emphasizes that subtraction is equivalent to adding the opposite of a number. The tutorial provides several examples to illustrate this concept, showing how to convert subtraction problems into addition problems and apply integer addition rules. The key takeaway is that subtraction can be simplified by rewriting it as addition of the opposite, making it easier to solve using familiar addition rules.

What is the key concept for subtracting integers?

• Dividing by two

• Subtracting the same number

• Multiplying by zero

• Adding the opposite

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CCSS.7.NS.A.1C

What should you do to a subtraction problem to make it easier to solve?

• Change it to addition of the opposite

• Multiply both numbers

• Divide both numbers

• Subtract the smaller number from the larger number

Tags

CCSS.7.NS.A.1C

In the example 3 - 12, what is the first step?

• Add 12 to 3

• Subtract 3 from 12

• Change 12 to -12

• Change subtraction to addition

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CCSS.7.NS.A.1C

What is the result of 3 + (-12)?

• -15

• -9

• 9

• 15

Tags

CCSS.7.NS.A.1C

In the example -8 - (-13), what is the first step?

• Subtract -8 from -13

• Change subtraction to addition

• Change -13 to 13

• Add -13 to -8

Tags

CCSS.7.NS.A.1C

What is the result of -8 + 13?

• 21

• 5

• -5

• -21

Tags

CCSS.7.NS.A.1C

In the example 9 - (-5), what is the first step?

• Change -5 to 5

• Subtract 9 from -5

• Change subtraction to addition

• Add -5 to 9

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CCSS.7.NS.A.1C

What is the result of 9 + 5?

• 4

• 14

• -4

• -14

Tags

CCSS.7.NS.A.1C

When you have multiple numbers to subtract, what should you do?

• Change all subtractions to additions of the opposite

• Add all the numbers first

• Multiply all the numbers

• Subtract the smallest number first

Tags

CCSS.7.NS.A.1C

What is the result of 0 + (-9) + 5?

• -4

• 4

• -14

• 14

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CCSS.7.NS.A.1D