Download Subtracting Integer

Mathletes Fab Five
Directions: Re-write the expression
as an addition problem and then
simplify.
1. -6 – 4
1) -6 + (-4) = -10
2. -7 – (-12)
2) -7 + 12 = 5
3. 12 – 16
3) 12 + (-16) = -4
4. 5 – (-19)
4) 5 + 19= 24
5. 23 – (-23)
5) 23 + 23 = 46
Lesson 1.3
Subtracting Integer
Word Problems
Video: Subtracting Integers PBS
• https://www.youtube.com/watch?v
=FsxXltuUFQM
Examples:
Monday’s high temperature was 6 degrees
Celsius. The low temperature was – 3
degrees Celsius. What was the difference
between the high and low temperature?
• What is the key word that tells you to subtract?
Difference
• Set up your subtraction problem:
6 - (-3)
• Turn it into an addition problem:
6+3
• Simplify:
9 degree difference
Examples:
The lowest point in the Pacific Ocean is about
-11,000 meters. The lowest point in the
Atlantic Ocean is about -8,600 meters. Which
ocean has the lower point? How much lower?
• Which Ocean has a lower point and why?
Pacific Ocean because -11,000 means that it is
11,000 meters under sea level.
• How much lower is -11,000 meters than -8,600?
-11,000 - (-8,600)
-11,000 + 8, 600
=-2,400 meters lower
Examples:
An ice cream company made a profit of
$24,000 in 2011. The same company had a
loss of $11,000 in 2012. What is the
difference between the company’s financial
results for 2011 and 2012?
• What is the key word that tells you to subtract?
Difference
• Set up your subtraction problem:
24,000 – (-11,000)
• Turn it into an addition problem:
24,000 + 11,000
• Simplify:
$35,000 difference
Homework
• Workbook Page 23 (#16-23
ALL)