1. Writing & Solving Equations

2. PROJECT Zaira spent 55 hours in 2 weeks working on a science project
PROJECT Zaira spent 55 hours in 2 weeks working on a science project. She worked 32 hours the first week. Write and solve an addition equation to find the amount of time she spent working the second week.
IDENTIFY & DEFINE THE VARIABLE
WHAT OPERATION SHOULD BE USED?
WHAT ELSE IS IMPORTANT? (What is being done to the variable)
WRITE THE EQUATION
(Does it make sense)
SOLVE THE EQUATION
DOES THE ANSWER MAKE SENSE IN TERMS OF THE PROBLEM?
T = time working 2nd week
addition
55 hours total for both weeks
32 hours for 1st week
T + 32 = 55
T = 23 hours

3. ROCKETS During a test flight, Jeri’s rocket reached a height of 18 yards. This was 7 yards less than the height of Devon’s rocket. Write and solve a subtraction equation to find the height of Devon’s rocket.
IDENTIFY & DEFINE THE VARIABLE
WHAT OPERATION SHOULD BE USED?
WHAT ELSE IS IMPORTANT? (What is being done to the variable)
WRITE THE EQUATION
(Does it make sense)
SOLVE THE EQUATION
DOES THE ANSWER MAKE SENSE IN TERMS OF THE PROBLEM?
H = height of Devon’s Rocket
Subtraction
Jeri’s rocket = 18 yds
18 is 7 yards less
H – 7 = 18
H = 25 yds.

4. CAT FOOD A grocery store is selling 6 cans of cat food for $3
CAT FOOD A grocery store is selling 6 cans of cat food for $3. Write and solve an equation to find the cost of a can of cat food.
C = cost of 1 can
Multiplication or Division
6 cans cost $3.00
$3.00/6 = c or 6c = $3.00
C = $0.50 per can

5. LAWN MOWING Ali was paid $75 for mowing a neighbor’s yard
LAWN MOWING Ali was paid $75 for mowing a neighbor’s yard. This is one fourth of the amount of money she earned all summer. How much did Ali earn all summer?
E = Amount Ali Earned
Multiplication or division
Earned $75 for one neighbor’s yard
$75 is ¼ of what he earned all summer
1/4m = $75 or m/4 = 75
M = 75 x 4 = $300