Understanding Sums with Different Signs

The video tutorial explains how to determine the sum of numbers with different signs. It covers two examples: adding 1.73 and -5, and adding 7 and -3.51. The tutorial demonstrates the process of finding absolute values, subtracting smaller values from larger ones, and determining the sign of the result based on the number with the larger absolute value. It also includes modeling these sums on a number line for better understanding.

What is the first step when adding numbers with different signs?

• Divide the numbers

• Add the numbers directly

• Find the absolute values of both numbers

• Multiply the numbers

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CCSS.7.NS.A.1B

In the example 1.73 + (-5), which number has the larger absolute value?

• Both have the same absolute value

• 1.73

• -5

• Cannot be determined

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CCSS.6.NS.B.3

When subtracting 1.73 from 5, what is the result?

• 3.23

• 3.25

• 3.29

• 3.27

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CCSS.7.NS.A.1C

Why is the sum of 1.73 + (-5) negative?

• Because 1.73 is negative

• Because -5 has a larger absolute value

• Because both numbers are negative

• Because 5 is positive

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CCSS.7.NS.A.1B

How do you model the sum 1.73 + (-5) on a number line?

• Move right 5 units, then left 1.73 units

• Move left 1.73 units, then right 5 units

• Move left 5 units, then right 1.73 units

• Move right 1.73 units, then left 5 units

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CCSS.6.NS.C.7C

In the second example, what is the absolute value of -3.51?

• 0

• 7

• -3.51

• 3.51

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CCSS.7.NS.A.1C

In the example 7 + (-3.51), what is the first step after finding absolute values?

• Divide the numbers

• Add the numbers

• Subtract the smaller absolute value from the larger

• Multiply the numbers

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CCSS.5.NBT.B.7

What is the result of subtracting 3.51 from 7?

• 3.53

• 3.49

• 3.51

• 3.47

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CCSS.7.NS.A.1B

Why is the sum of 7 + (-3.51) positive?

• Because -3.51 is positive

• Because 7 has a larger absolute value

• Because both numbers are positive

• Because 7 is negative

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CCSS.7.NS.A.1C

What is the final result of the sum 7 + (-3.51)?

• -3.51

• 3.51

• -3.49

• 3.49

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CCSS.7.NS.A.1C