A guide for **negative numbers **and their real-world applications

Author

Tess Loucka

Published

January 22, 2024

A guide for **negative numbers **and their real-world applications

Author

Tess Loucka

Published

Jan 22, 2024

A guide for **negative numbers **and their real-world applications

Author

Tess Loucka

Published

Jan 22, 2024

Key takeaways

- A negative number is any number smaller than zero.
- Two negative signs next to each other can be replaced by one positive sign (+).
- When multiplying or dividing two numbers with the same sign, the result is positive. If the numbers have different signs, the result is negative.

Have you ever woken up in the morning to see frost covering your window and snow piled high on the ground outside? Or maybe you’ve peeked into your freezer to see icicles hanging from the ceiling, and ice covering bags of frozen peas.

In these instances, you may have looked at a thermometer wondering just how cold it is. Sometimes it’s so cold the number on the thermometer is less than 0 and the numbers turn into negatives. But what is a negative number anyways?

We see numbers every day when reading the forecast, making purchases, or getting a score on a quiz, and they’re not always positive! In our daily life, and in maths problems, we come across **negative numbers **all the time.

So, let’s go over what **negative numbers **are and how they’re used.

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**Negative numbers **are any numbers smaller than zero. They are represented with a minus sign (-) followed by a digit, such as -3, -2, -1, etc.

The highlighted side of the number line above is the **negative numbers **side. They are to the left of the 0 because they have a smaller value than 0. Those to the right of the 0 are positive numbers. They have a greater value than 0.

As stated above, a negative number is any number smaller than zero. However, there are a few more properties of **negative numbers **that you should know.

- A negative number does not have to be a round number. Unlike integers which must be round numbers,
**negative numbers**can be decimals or fractions, too. - Negative numbers are real numbers. Real numbers in maths include both rational and irrational numbers.
- Negative numbers are not natural numbers. Natural numbers only refer to positive integers, not including 0.
- Negative numbers are not whole numbers. Whole numbers only include positive integers and 0.

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We already mentioned that negative numbers appear on thermometers to show us that the temperature is “below zero”, but that’s not the only real-life example of negative numbers.

Negative numbers are all around us! When we make purchases, the money or credit due is a negative number. Negative numbers also appear on elevation maps to indicate places that are “below sea level”.

Negative numbers can be used as penalties in games, quizzes, and tests. When you get an answer wrong, you may get -5 points, meaning 5 points are being taken away from your total score.

In sports, too, negative numbers can be used to denote the scores of teams. One great example is golf. The golfer with the lowest score, which represents the least amount of strokes, wins!

As you can see, there are many real-world applications of negative numbers. They may not be as common as positive numbers, but they’re just as important.

Now, let’s go over the rules for working with negative numbers.

When working with negative numbers in addition and subtraction problems, there are certain laws that you will find to always be true. Remember these laws to make solving problems with negative numbers in the future easy!

One tip for **adding and subtracting negative numbers **involves the number signs beside each digit (+ or -):

- If the signs are the same, you can replace them with a plus sign (+).
- If the signs are different, you can replace them with a minus sign ( -).

When **adding negative numbers**, if the signs of the two numbers you are adding are the same, add the numbers together and keep the sign the same.

-6 + -2 = -8

Since + and – are next to each other in this problem, you can replace them with one negative sign (-). So, this problem can also be written as -6 – 2 = -8

If the signs of the two numbers are different, keep the sign of the greater absolute value.

6 + -2 = 4

Again, you can replace the + and – with one – sign. So, this problem can also be written as 6 – 2 = 4.

When **subtracting negative numbers**, if the signs of the numbers are both negative, switch the two adjacent negative signs to a positive.

-6 – (-2) = -4 can also be written as -6 + 2 = -4

If the signs of the numbers are different, switch the subtraction sign to an addition sign, and switch the sign of the second number.

-6 – 2 = -8 becomes -6 + -2 = -8

-2 – 6 = -8 becomes -2 + -6 = -8

The laws to remember when multiplying and dividing negative numbers are actually more straightforward than those for adding and subtracting them.

All you need to know is that when multiplying or dividing numbers with the same sign, the result will be positive. If the signs are different, the result will be negative.

When** multiplying two negative numbers** together, the result will be a positive number.

-6 x -2 = 12

When multiplying a positive number with a negative number, the result will be a negative number.

6 x -2 = -12

When **dividing two negative numbers **together, the result is a positive number.

-6 ÷ -2 = 3

When dividing a positive number and a negative number, the result is a negative number.

6 ÷ -2 = -3

The more examples of negative number equations you go over, the more comfortable you will be with working with negative numbers. A good maths app can provide you with as many examples as you need, as well as detailed solutions and explanations that make learning maths easy and fun.

*Click on the boxes below to see the answers!*

Question 1: What is -10 - (-4)?

**subtracting negative numbers**, remember that two negatives equal a positive. Change the two negative signs into a positive. -10 – (-4) becomes -10 + 4. You can use mental math or a number line to get **-6 as your answer. **

Question 2: What is -4 x 5?

Multiplying any two numbers with different signs results in a negative number. So, -4 x 5 is **-20. **

Question 3: What is -9 + -3?

**-12**. You can also rewrite this as -9 – 3.

Yes, negative numbers are real numbers.

Negative round numbers are integers, but any fractions or decimals are not.

No, negative numbers are not whole numbers. Whole numbers are only positive round numbers, including 0.

Most negative numbers are rational numbers. If a number can be written as a fraction, that means it is a rational number.

Parents, sign up for a DoodleMaths subscription and see your child become a maths wizard!

Lesson credits

Tess Loucka

Tess Loucka discovered her passion for writing in school and hasn't stopped writing since! Combined with her love of numbers, she became a maths and English tutor. Since graduating, her goal has been to use her writing to spread knowledge and the joy of learning to readers of all ages.

Tess Loucka

Tess Loucka discovered her passion for writing in school and hasn't stopped writing since! Combined with her love of numbers, she became a maths and English tutor. Since graduating, her goal has been to use her writing to spread knowledge and the joy of learning to readers of all ages.

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