### All PSAT Math Resources

## Example Questions

### Example Question #2 : How To Add / Subtract / Multiply / Divide Negative Numbers

If x is a negative integer, what else must be a negative integer?

**Possible Answers:**

x² – x

x – x

x²

x – (–x)

**Correct answer:**

x – (–x)

By choosing a random negative number, for example: –4, we can input the number into each choice and see if we come out with another negative number. When we put –4 in for x, we would have –4 – (–(–4)) or –4 – 4, which is –8. Plugging in the other options gives a positive answer. You can try other negative numbers, if needed, to confirm this still works.

### Example Question #1 : Negative Numbers

–7 – 7= x

–7 – (–7) = y

what are x and y, respectively

**Possible Answers:**

x = 0, y = 0

x = –14, y = 14

y = 0, x = 14

x = –14, y = 0

x = 14, y = –14

**Correct answer:**

x = –14, y = 0

x: –7 – 7= –7 + –7 = –14

y: –7 – (–7) = –7 + 7 = 0

when subtracting a negative number, turn it into an addition problem

### Example Question #1 : How To Subtract Negative Numbers

**Possible Answers:**

2

15

5

16

13

**Correct answer:**

16

Subtracting a negative number is just like adding its absolute value.