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Intro to Negative Numbers
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 We’ll learn that positive numbers are greater than zero and negative numbers are less than zero.
 That opposite numbers are the same distance from zero, but on opposite sides of a number line.
 And we'll see that this knowledge can help us understand the weather, pay for things, and explore the globe.

Discussion Questions

Before VideoWhich temperature is better for going swimming: 0°C or 34°C? How do you know?ANSWER

34°C, because it is warmer. 0°C is too cold.

Draw tick marks near the middle for 0 and to the right for 34, then put a dot on each one.

Draw a horizontal line with the numbers 15 through 20 from left to right, or a vertical line with the numbers 15 through 20 from bottom to top. Draw and label tick marks for each number.

15°C is 5°C cooler, because it is farther left (or lower) on a number line.

1°C; 0°C


After VideoWhat does the greater than symbol look like? How is it different from the less than symbol?ANSWER

Greater than opens to the left (>), and less than opens to the right (<).

Both numbers are the same distance from zero, in opposite directions.

The second equation is true, because –3 is 3 units away from zero. The first equation cannot be true, because absolute values are never negative.

–12 is greater, because it is farther to the right on a number line. It is closer to zero on the negative side of the number line.

–6 < –1 < 0 < 2 < –4



Vocabulary

Positive number
DEFINE
A number that is greater than zero.

Negative number
DEFINE
A number that is less than zero.

Compare
DEFINE
When you compare two numbers, you decide which number is greater and which is lesser.

Number line
DEFINE
A line, usually horizontal or vertical, with numbers placed in their correct position.

Opposite numbers
DEFINE
Two numbers that are the same distance from zero on opposite sites.

Absolute value
DEFINE
How far a number is from zero (i.e. magnitude without direction).

Positive number
DEFINE

Reading Material
Download as PDF Download PDF View as Separate PageWHAT ARE NEGATIVE NUMBERS?Positive numbers are numbers greater than zero. Negative numbers are numbers less than zero. For each positive number there is a matching negative number. These numbers are called opposites.
To better understand negative numbers…
WHAT ARE NEGATIVE NUMBERS?. Positive numbers are numbers greater than zero. Negative numbers are numbers less than zero. For each positive number there is a matching negative number. These numbers are called opposites. To better understand negative numbers…LET’S BREAK IT DOWN!
Intro to negative numbers.
A tank of liquid nitrogen is at –196°C. A package of dry ice is at –78°C. These are examples of negative numbers. A negative number has a value that is less than zero. On a horizontal number line, these numbers are to the left of zero. Counting negative numbers is a lot like counting positive numbers: negative 1, negative 2, negative 3, and so on. Try this one yourself: Count down from 5 to –5.
Intro to negative numbers. A tank of liquid nitrogen is at –196°C. A package of dry ice is at –78°C. These are examples of negative numbers. A negative number has a value that is less than zero. On a horizontal number line, these numbers are to the left of zero. Counting negative numbers is a lot like counting positive numbers: negative 1, negative 2, negative 3, and so on. Try this one yourself: Count down from 5 to –5.Temperatures can be negative numbers.
When you look at weather forecasts, you can see negative numbers. Temperatures can contain a negative sign, such as –1°C, 196°C, and 15°C. You can count by counting down on a thermometer: 2°C, 1°C are positive numbers. Next is 0°C which is neither positive nor negative. Then –1°C, 2°C, 3°C. The numbers 1 and –1 are an example of opposite numbers, because they are the same distance from zero, in opposite directions. Try this one yourself: Explain why 8 and –8 are opposites. Use a realworld scenario and a number line to support your answer.
Temperatures can be negative numbers. When you look at weather forecasts, you can see negative numbers. Temperatures can contain a negative sign, such as –1°C, 196°C, and 15°C. You can count by counting down on a thermometer: 2°C, 1°C are positive numbers. Next is 0°C which is neither positive nor negative. Then –1°C, 2°C, 3°C. The numbers 1 and –1 are an example of opposite numbers, because they are the same distance from zero, in opposite directions. Try this one yourself: Explain why 8 and –8 are opposites. Use a realworld scenario and a number line to support your answer.You can compare negative numbers.
You can compare negative numbers by imagining where the numbers would be on a number line. Like with positive numbers, lesser numbers are on the left and greater numbers are on the right. In Yellowknife, Canada, the temperature today is –15°C. In Norilsk, Russian, it is –30°C. Which place is colder? Colder means lesser temperature, so you need to find which number is lesser. –30 is to the left of –15, so –30 < –15. Norilsk is colder than Yellowknife. Try this one yourself: Compare –45 and –16.
You can compare negative numbers. You can compare negative numbers by imagining where the numbers would be on a number line. Like with positive numbers, lesser numbers are on the left and greater numbers are on the right. In Yellowknife, Canada, the temperature today is –15°C. In Norilsk, Russian, it is –30°C. Which place is colder? Colder means lesser temperature, so you need to find which number is lesser. –30 is to the left of –15, so –30 < –15. Norilsk is colder than Yellowknife. Try this one yourself: Compare –45 and –16.Your bank balance can also be negative.
We can use negative numbers to express the amount of money owed. For example, Emily wants to buy a Tshirt online. She has $10 in her bank account. The Tshirt Emily wants costs $15. If she tries to buy that Tshirt, she doesn’t have enough money. Her bank allows the purchase to go through, but then Emily’s account balance is –$5. This means she has less than $0 in her bank account because she owes the bank $5. She has to give $5 back to get to a balance of $0 again. Try this one yourself: If Amari starts with $25 in his bank account, spends it all, and then buys something for $12, what is Amari’s account balance?
Your bank balance can also be negative. We can use negative numbers to express the amount of money owed. For example, Emily wants to buy a Tshirt online. She has $10 in her bank account. The Tshirt Emily wants costs $15. If she tries to buy that Tshirt, she doesn’t have enough money. Her bank allows the purchase to go through, but then Emily’s account balance is –$5. This means she has less than $0 in her bank account because she owes the bank $5. She has to give $5 back to get to a balance of $0 again. Try this one yourself: If Amari starts with $25 in his bank account, spends it all, and then buys something for $12, what is Amari’s account balance?Your elevation can be negative.
Another use of negative numbers is understanding elevation, the distance above or below sea level. Some areas are above sea level and are represented with positive numbers. Areas at sea level are represented with the number zero. Some areas are below sea level and are represented with negative numbers. The top of Mount Everest, a very large mountain, is 8,846 meters above sea level. On the other hand, the lowest elevation in the United States is in Death Valley, California, at 86 meters below sea level. This elevation can be represented by the number –86. –86 is 86 units below zero on a vertical number line. Try this one yourself: The Dead Sea in Israel is 430 meters below sea level. What number represents the elevation of the Dead Sea?
Your elevation can be negative. Another use of negative numbers is understanding elevation, the distance above or below sea level. Some areas are above sea level and are represented with positive numbers. Areas at sea level are represented with the number zero. Some areas are below sea level and are represented with negative numbers. The top of Mount Everest, a very large mountain, is 8,846 meters above sea level. On the other hand, the lowest elevation in the United States is in Death Valley, California, at 86 meters below sea level. This elevation can be represented by the number –86. –86 is 86 units below zero on a vertical number line. Try this one yourself: The Dead Sea in Israel is 430 meters below sea level. What number represents the elevation of the Dead Sea?Use absolute value to compare liquid nitrogen and dry ice.
A tank of liquid nitrogen is at –196°C. A package of dry ice is at 78°C. Both are very cold. How do they compare? –78°C > 196°C, because –78 is closer to zero than –196. –196 < –78, because –196 is further from zero than –78. These comparisons can look confusing because with positive numbers, we write 78 < 196 and 196 > 78. When comparing two negative numbers, the number with the greater absolute value is actually the lesser number. Absolute value is the distance of a number from 0 on a number line. For example, the absolute value of –196, also written as –196, is 196, since it is 196 units from 0. The absolute value of –78, also written as –78, is 78. Since –196 has the greater absolute value, it’s the lesser number. Try this one yourself: In Harbin, China, January temperatures are around –20℃. In International Falls, Minnesota, January temperatures are around –10℃. Which place is warmer? Use absolute value to explain your answer.
Use absolute value to compare liquid nitrogen and dry ice. A tank of liquid nitrogen is at –196°C. A package of dry ice is at 78°C. Both are very cold. How do they compare? –78°C > 196°C, because –78 is closer to zero than –196. –196 < –78, because –196 is further from zero than –78. These comparisons can look confusing because with positive numbers, we write 78 < 196 and 196 > 78. When comparing two negative numbers, the number with the greater absolute value is actually the lesser number. Absolute value is the distance of a number from 0 on a number line. For example, the absolute value of –196, also written as –196, is 196, since it is 196 units from 0. The absolute value of –78, also written as –78, is 78. Since –196 has the greater absolute value, it’s the lesser number. Try this one yourself: In Harbin, China, January temperatures are around –20℃. In International Falls, Minnesota, January temperatures are around –10℃. Which place is warmer? Use absolute value to explain your answer. 
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Science & Math$_{/yr}

Science Only$_{/yr}
Give an example of a negative number. Explain what your number means in a realworld situation, such as temperature or elevation.
What number is the opposite of 12? Use absolute value to explain your answer.
Which number is less: –15 or –16? Explain your answer.
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