Solving Decimal Equations
Lesson 3-9
Examples
1.
g – 3.1 = 4.5
2.
3k = 8.1
Examples
m
3. /5
= 1.5
4. 4.93 = 0.563 + v
Felipe has earned $42.50
by mowing lawns for his
neighbors. He wants to
buy inline skates that cost
$69.95. Write and solve
an equation to find out
how much more money
Felipe must earn to buy
the skates.
Equation
$42.50 + m
= $69.95
Solve for Equation
$42.50 + m
- $42.50
m
= $69.95
- $42.50
= $24.75
Use inverse
operation to get the
variable alone on one
side of the equation.
Felipe needs $27.45 more to buy the inline skates.
Problem Solving
The area of the floor in Jonah’s bedroom
is 28 meters. If the length is 3.5 meters,
what is the width of the bedroom?
Area = length x
width
Problem Solving
Jonah is carpeting his bedroom. The
carpet cost $22.50 per square meter. What
is the total cost to carpet his bedroom?
Hint: total cost = area x cost of the carpet per square meter