Directed Numbers
Directed numbers (integers) include positive numbers, negative numbers, and zero. They are used to describe quantities that can have both size and direction, such as temperature, debt, and altitude.
What You Need to Know
Key Concept Diagram
Adding a negative number is the same as subtracting: 5 + (−3) = 5 − 3 = 2
Subtracting a negative number is the same as adding: 5 − (−3) = 5 + 3 = 8
Multiplying or dividing two numbers with the same sign gives a positive result
Multiplying or dividing two numbers with different signs gives a negative result
Key Vocabulary
Directed number
A number with both a size (magnitude) and a sign (+ or −)
Integer
A whole number — positive, negative, or zero
Positive
Greater than zero; to the right of zero on the number line
Negative
Less than zero; to the left of zero on the number line
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
Calculate: −4 + (−7)
Question 2
Calculate: −6 − (−2)
Question 3
Calculate: (−3) x (−5)
Key Concepts Summary
- ●Adding a negative number is the same as subtracting: 5 + (−3) = 5 − 3 = 2
- ●Subtracting a negative number is the same as adding: 5 − (−3) = 5 + 3 = 8
- ●Multiplying or dividing two numbers with the same sign gives a positive result
- ●Multiplying or dividing two numbers with different signs gives a negative result