WRITING SOLVING EQUATIONS PROJECT Zaira spent 55 hours

WRITING & SOLVING EQUATIONS

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? T = time working 2 nd week addition 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? • 55 hours total for both weeks 32 hours for 1 st week T + 32 = 55 T = 23 hours

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) • H – 7 = 18 SOLVE THE EQUATION H = 25 yds. 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

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. 00/6 = c or 6 c = $3. 00 C = $0. 50 per can

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 1/4 m = $75 or m/4 = 75 M = 75 x 4 = $300