Positive or negative
Adding and subtracting rational numbers
Brain twisters
Word problems
Create your own
100

Is the sum of -67 + 41 positive or negative?

Negative

100

Use a model to find -10+12. Show your work.

-10+12=2

Possible models: number line, integer chips

100

Jeremy says that the sum of two numbers can never be negative. Explain why Jeremy's reasoning is incorrect. Use a model. Show your work.

Possible explanation: 4+(-6)=-2. The sum of these two numbers is negative. 

Possible models: number line, integer chips

100

In the middle of a game, Dawn has a score of -17. At the end of the game, Dawn's score increases by 21. What is Dawn's score at the end of the game? Show your work. 

Dawn's score is 4. 

Possible student work: Number line

100

What situation could the expression (-19) - 4 represent? 

Possible answer: The temperature was -19 degrees. Then it decreased 4 degrees. 

200

Is the sum of 615 + (-615) + (8.4) positive or negative?

Positive

200

Use a model to find -9+9. Show your work. 

Does the order in which you add -9 and 9 matter? Explain your reasoning. 

-9+9=0

Possible models: number line, integer chips

No; Possible explanation: (-9)+9=0 and 9+(-9)=0

200

How is adding 2 + (-2) similar to adding 2 + 2? How is it different? Use words and models to explain. Show your work. 

Possible explanation: They are similar because you start at 0 and move 2 units to the right. They are different because -2 is 2 units to the left and 2 is 2 units to the right. 2 + (-2) = 0 and 2 + 2 = 4.

200
In a card game, Eli's score is -398 points. In the second round of the game, he earns 466 points. What is his score after the second round? 

68 points

200

Write a word problem to represent the following equation: -2 + (-3) = -5

Possible answer: A tadpole was 2 cm below the water's surface. It sank an additional 3 cm. What is the tadpole's new elevation? 

300

Is the sum of 2.4 + (-2 6/10) positive or negative?

Negative

300

What is the sum of -26 and -37?

-63

300

What value of x makes the following statement true? 1.9 - x = a negative number

Any value greater than 1.9

300
The bottom of a pond is -12.6 ft relative to the surface of the pond. Brendan is on a patio that is 2.7 ft above the surface of the pond. How many feet apart are Brendan and the bottom of the pond? 

15.3 ft apart

400

Is the sum of 9 4/5 + (-2 3/5) positive or negative?

Positive

400

Find 2 1/10 + (-5 2/5). Show your work. 

-3 3/10

400

Why does -3.6 - (-4) have the same result as -3.6 + 4? Explain your reasoning. 

Possible explanation: Subtracting a number and adding its opposite do the same thing. So, subtracting -4 and adding 4 have the same result. 
400

An anchor is 15 3/5 m below the surface of the ocean. The anchor is lowered 4 1/5 m. Then it is pulled up 12 3/5 m. What is the anchor's new position relative to the surface of the ocean? Show your work. 

-7 1/5; The anchor is 7 1/5 m below the surface of the ocean. 

500

The sum of -21.8 and a number is positive. Identify a possible value for that number. Explain your selection. 

Possible answer: 22; Since 22 is greater than 21.8, the sum of -21.8 and 22 is positive. 

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