Adding Positive and Negative Integers Worksheets | Grade1to6.com - Free Printable

Let's solve the problems step by step.

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Part 1: Adding Integers (Tables)

We need to fill in the tables by performing the operations given (+ or -) on the numbers in each column.

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#### Problem 1:
```
+ 2 5 9 8 9
+ 3 4 5 6
```

Add each pair:

- 2 + 3 = 5
- 5 + 4 = 9
- 9 + 5 = 14
- 8 + 6 = 14
- 9 + 6 = 15

✔ Answers: 5, 9, 14, 14, 15

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#### Problem 2:
```
8 6 9 4 5
− 2 5 6 4 3
```

Subtract each pair:

- 8 - 2 = 6
- 6 - 5 = 1
- 9 - 6 = 3
- 4 - 4 = 0
- 5 - 3 = 2

✔ Answers: 6, 1, 3, 0, 2

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#### Problem 3:
```
9 9 9 9 9
− 3 3 3 3 3
```

Subtract each pair:

- 9 - 3 = 6 (all same)
- So all answers are 6

✔ Answers: 6, 6, 6, 6, 6

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#### Problem 4:
```
4 5 4 5 0
+ 2 6 4 7 8
```

Add each pair:

- 4 + 2 = 6
- 5 + 6 = 11
- 4 + 4 = 8
- 5 + 7 = 12
- 0 + 8 = 8

✔ Answers: 6, 11, 8, 12, 8

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✔ Summary of Table Answers:

| Problem | Answers |
|--------|--------|
| 1 | 5, 9, 14, 14, 15 |
| 2 | 6, 1, 3, 0, 2 |
| 3 | 6, 6, 6, 6, 6 |
| 4 | 6, 11, 8, 12, 8 |

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Part 2: Word Problems on Integers

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#### Problem 1: Elevator
> An elevator is on the twenty-first floor. It goes down 9 floors and then up 6 floors. What floor is the elevator on now?

Step-by-step:

- Start: 21st floor
- Goes down 9 floors: 21 - 9 = 12
- Then goes up 6 floors: 12 + 6 = 18

✔ Answer: 18th floor

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#### Problem 2: Temperature Drop
> If it is 9° outside and the temperature will drop 12° in the next six hours, how cold will it get?

Step-by-step:

- Current temp: 9°C
- Drops by 12°C → 9 - 12 = -3°C

✔ Answer: -3°C

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#### Problem 3: Change in Temperature
> The temperature was –2°C last night. It is now –6°C. What was the change in temperature?

Step-by-step:

- Final temp: -6°C
- Initial temp: -2°C
- Change = Final - Initial = (-6) - (-2) = -6 + 2 = -4°C

So the temperature decreased by 4°C.

✔ Answer: -4°C (or a decrease of 4°C)

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✔ Final Answers for Word Problems:

1. 18th floor
2. -3°C
3. -4°C (change)

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