Understanding integers
key notes:
| 🥏A positive number can represent a gain or an increase. 🥏A negative number can represent a loss or a decrease. |
🥏An integer is a number without a fractional part. Integers can be positive, negative, or zero. All whole numbers are integers. Here are some examples of integers:
-42, -2, 0, 3, 180
Numbers like 3.5 and –1/2 are not integers. They have fractional parts.
You can write the set of integers like this:
{…, –3, –2, –1, 0, 1, 2, 3, …}
Learn with an example
Which integer represents this scenario?
🥏 5 more centimeters of rain this year
-5 5
Read the scenario:
5 more centimeters of rain this year
This scenario involves a gain or an increase. Use a positive integer to represent this scenario.
The integer 5 represents this scenario.
Which integer represents this scenario?
🥏 adding 6 stuffed animals to a collection
-6 6
Read the scenario:
adding 6 stuffed animals to a collection
This scenario involves a gain or an increase. Use a positive integer to represent this scenario.
The integer 6 represents this scenario.
Which integer represents this scenario?
🥏 9 degrees below zero
-9 9
Read the scenario:
9 degrees below zero
This scenario involves a loss or a decrease. Use a negative integer to represent this scenario.
The integer –9 represents this scenario.
let’s practice:
