Table of Contents

## What happens when you add a negative number and subtract it?

When you’d subtracted a positive number, you’d moved to the left. Now, if you’re adding a negative, you can regard this is pretty much the same as when you were subtracting a positive, if you view “adding a negative” as adding to the left.

**When does a number become a negative sign?**

It can all be put into two rules: They are “like signs” when they are like each other (in other words: the same). So, all you have to remember is: Example: What is 5+ (−2) ? + (−) are unlike signs (they are not the same), so they become a negative sign.

### Why do I get a negative time in Excel?

Excel allows you to perform math using times as operands. If you subtract a later time from an earlier time, you should end up with a negative time. If you don’t see the negative time, it could be because of the way you have Excel configured.

**What does it mean when a number has no sign?**

If a number has no sign it usually means that it is a positive number. Let us think about numbers as balloons (positive) and weights (negative): Adding positive numbers is just simple addition. Subtracting positive numbers is just simple subtraction. Now let’s see what adding and subtracting negative numbers looks like:

#### When do you put around a number is it a positive or negative?

“+” is the positive sign, “−” is the negative sign. When a number has no sign it usually means that it is positive. And we can put () around the numbers to avoid confusion.

**Why does a negative times a negative make sense?**

I think that the “0” always has to be at the center of the two sides (negative/positive infinity) in order for them to be balanced. If I see -3*-4 it means “start from zero” and take out 4 groups of negative 3s from the number line (make them disappear).

## What happens when a negative number comes after the subtraction sign?

That is, if a negative number comes after the addition sign, it means you move to the left instead of the right on the number line. Vice versa, if a negative number comes after the subtraction sign, it means you move to the right instead of to the left on the number line. Let’s look at the example below. 2 + (-2)

Excel allows you to perform math using times as operands. If you subtract a later time from an earlier time, you should end up with a negative time. If you don’t see the negative time, it could be because of the way you have Excel configured.