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Lesson 1: Intro to negative numbers

# Introduction to negative numbers

Negative numbers are essential in math, representing values below zero. On a number line, they appear to the left of zero, opposite positive numbers. They're commonly used in real-world situations like measuring temperatures below freezing. Understanding negative numbers helps us grasp a broader range of mathematical concepts. Created by Sal Khan.

## Want to join the conversation?

• Why is your voice so cool Mr khan?
• he is cool
• How do you subtract positive and negative numbers ?
• subtracting a positive is just counting sown from it but subtracting a negative is like the number is getting bigger just dont forget the (-) sign
• Why are there negative numbers
• Good question! Negative numbers allow us to subtract a larger number from a smaller number and get a meaningful answer. For example, without negative numbers, we can’t do 3 - 8. With negative numbers, we can do 3 - 8 to get the meaningful answer of -5.

In real life, negative numbers can represent debts (amounts of money owed), withdrawals from a bank account, losses, backwards offensive plays on a football field (for example the quarterback is sacked), temperatures below 0, and heights below sea level.

In chess, a number is often used to evaluate a position. A positive number represents an advantage for white, while a negative number represents an advantage for black.

If you ever study Vedic math, which is an Indian system of arithmetic and algebra tricks, you will sometimes encounter negative digits (symbolized with bars above the digits instead of negative signs in front of the digits).
• Would negative numbers be the same as decimals…like -1 is equal to 1 ?
• Negative numbers and decimals are not necessarily the same thing. For example, 0.8 is a decimal that is positive, and -5 is negative but has no decimal part.

Have a blessed, wonderful day!
• why do we even need math in life is our life a math problem?
• Hello Victoria!

In everyday life, we use mathematics for things such as incomes, and expenses, or home-task things. We also can use mathematics for science, and we are able to get great jobs with prior mathematic experience. Mathematics also appears all around us. There are much more things that we can use with mathematics, but I suggest for you to go read a article about it if interested.

Hope this helps!
• If we use math for negative numbers... Can we use it for Negative degrees?
• For Fahrenheit or Celsius temperatures, it is possible to have negative degree measurements for extreme cold.

For angles, usually only positive degree measurements are seen in geometry. However, sometimes negative degree measurements are seen in trigonometry. Clockwise represents the negative direction for angles in trigonometry.

Have a blessed, wonderful day!
• Mom help the math man is rotting my brain!
• You are wrong! Sal makes math fun. This man is a genius! Thanks Sal.