ADDING/SUBTRACTING RATIONAL NUMBERS

-7.8 + (-0.8)

• 8.6
• -8.6
• 7
• -7

Bob lost 5 points on page one of his math test and he lost 9 points on page two of his math test.  Which equation best describes Bob progress on his math test?

• 5 + 9 = 14
• -5 + -9 = -4
• -5 + -9 = -14
• 5 + -9 = -4

At 2pm, the temperature was 15 degrees. By midnight, the temperature dropped by 30 degrees. What is the temperature at midnight?

• 45 degrees
• -45 degrees
• 15 degrees
• -15 degrees

• 7
• 5
• -7
• -5

• 9
• 10
• -9
• -10

-5 − (-7)

• -12

• 12

• 2

• -2

• -15 - 5 = -10
• -15 - 5 = -20
• 15 - 5 = 20
• -15 - (-5) = -20

• 7 + 10 = 3
• -7 + 10 = 3
• -7 - 10 = 3
• -7 + 3 = 10

Look at the number line.

• –2 + 4 =  –2
• –2 + (–4) =  –6
• 4 + (–6) =  –2
• 4 + (–2) =  6

Choose the equation that best represents the model.

• 2 + (–6) =  –4
• 0 – 6 = –6
• –6 + 8 = 2
• 8 + (–6) = 2