Adding and Subtracting Positive and Negative Decimals

The video tutorial reviews the concept of integers and introduces the addition of positive and negative decimal values. It explains how to add numbers with the same sign and different signs, using strategies like ignoring signs and focusing on the magnitude of numbers. The tutorial includes practice problems and emphasizes the importance of understanding the logic behind the rules rather than just memorizing them. It also covers estimation techniques to verify answers.

What is an integer?

• A number with a decimal

• A positive or negative number without a decimal

• A fraction

• A positive number only

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What should you do if two numbers have the same sign?

• Subtract them

• Multiply them

• Add them

• Divide them

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CCSS.7.NS.A.1C

If you add -5.2 and -3.1, what is the result?

• -8.3

• 2.1

• -2.1

• 8.3

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CCSS.7.NS.A.1C

What happens when you add a positive number to a negative number?

• You add the numbers together

• You always get a positive result

• You subtract the smaller number from the larger number

• You always get a negative result

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CCSS.7.NS.A.1C

What is the result of 7.5 + (-2.3)?

• 9.8

• 5.2

• -5.2

• -9.8

Tags

CCSS.7.NS.A.1C

When adding numbers with different signs, what should you do after ignoring the signs?

• Add the numbers

• Subtract the smaller number from the larger number

• Divide the numbers

• Multiply the numbers

Tags

CCSS.7.NS.A.1C

What is the result of -4.7 + 10.2?

• -5.5

• 5.5

• 14.9

• -14.9

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CCSS.6.NS.B.3

If you have 8.2 + 3.33, what is the result?

• 11.53

• 4.87

• 5.13

• 10.53

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CCSS.7.NS.A.1C

What is the result of 18.6 + (-27.8)?

• 46.4

• 9.2

• -9.2

• -46.4

Tags

CCSS.7.NS.A.1C

What is the result of 132 + (-23.7)?

• 155.7

• 108.3

• 155.3

• 108.7

Tags

CCSS.7.NS.A.1C