Negative numbers introduction | Negative numbers and absolute value | Pre-Algebra | Khan Academy

TL;DR

Negative numbers are any number less than 0, and they can be encountered in everyday life in contexts like temperature and bank accounts.

Transcript

In this video, I want to familiarize ourselves with negative numbers, and also learn a bit of how do we add and subtract them. And when you first encounter them, they look like this deep and mysterious thing. When we first count things, we're counting positive numbers. What does a negative number even mean? But when we think about it, you probably ... Read More

Key Insights

• 🏦 Negative numbers represent values less than 0 and can be encountered in temperature measurements and bank accounts.
• #️⃣ On a number line, negative numbers are represented to the left of 0 and increase in magnitude as you move further left.
• #️⃣ Subtracting a negative number is equivalent to adding a positive number.

Questions & Answers

Q: What is a negative number?

A negative number is any number less than 0. It represents a value that is smaller or lower than a reference point, often 0.

Q: How are negative numbers encountered in everyday life?

Negative numbers can be encountered in temperature measurements, where colder temperatures are represented by negative values. They can also be encountered in bank accounts, where a negative balance indicates owing money to the bank.

Q: How are negative numbers represented on a number line?

On a number line, negative numbers are represented to the left of 0. As you move to the left, the value of the number increases in the negative direction.

Q: Can negative numbers be smaller than other negative numbers?

Yes, negative numbers can vary in magnitude. For example, -100 is smaller than -1. The further left you go on the number line, the smaller the negative number becomes.

Summary & Key Takeaways

• Negative numbers are any number less than 0 and can be represented on a number line to the left of 0.

• Negative numbers can be encountered in temperature measurements, where a decrease in temperature is represented by a negative number.

• Negative numbers can also be encountered in bank accounts, where spending more money than available results in a negative balance.