Evaluate the following expressions on scratch paper without a calculator (this means to find the answer):

1. 10 - 3 =

2. -4 - 8 =

3. -10 - 1 =

4. -5 - 7 =

I can add and subtract integers.

Here's how you do that:

1. Check if the problem is addition or subtraction. How can you tell?
   2. If it's subtraction, change it into addition, then change the number that follows to its opposite (positive becomes negative, negative becomes positive).

3. Then, use the soldier method!

Let's try some examples together:

1. 5 + 1

2. 5 - 1

3. 4 + -2

4. 4 - - 2

5. -9 + -5

6. -9 - - 5

7. 10 + -3

8. 10 - - 3

9. -14 + -8

10. -14 - - 8

11. 3 + -9

12. 3 - - 9

Get out your telepathy machines!

Complete these problems for a 3

Complete these problems for a 4

Complete these problems for a 5

Let's practice together!