This lesson teaches how to solve multi-step word problems involving positive and negative decimals. It uses a practical example where Henry wants to buy a video game costing $42. Henry has saved $32, and his mom will match 20% of his savings. The lesson emphasizes the importance of checking if the final answer is reasonable. It demonstrates both graphical and mathematical methods to solve the problem, highlighting the use of expressions and order of operations. The lesson concludes by explaining how to determine if Henry has enough money and how much more he needs.

What is the main focus of this lesson?

• Solving multi-step word problems with decimals

• Understanding fractions

• Solving algebraic equations

• Learning about geometry

What is a common mistake students make when solving word problems?

• Not using a calculator

• Ignoring the problem statement

• Not checking if the final answer is reasonable

• Using incorrect units

How much has Henry saved for the video game?

• $42

• $32

• $20

• $50

What percentage of Henry's savings will his mom match?

• 25%

• 10%

• 20%

• 15%

How much money will Henry's mom contribute?

• $8.00

• $5.00

• $6.40

• $7.20

What is the total amount Henry has after his mom's contribution?

• $44.00

• $42.00

• $40.00

• $38.40

How much more money does Henry need to buy the video game?

• $3.60

• $5.00

• $2.00

• $4.20

What does a negative difference indicate in this problem?

• Henry needs more money

• Henry has exactly the right amount

• Henry has enough money

• Henry has extra money

What is the first step in solving the problem using a mathematical expression?

• Adding Henry's savings

• Subtracting the cost of the game

• Simplifying the expression inside the parentheses

• Multiplying the savings by 10%

What is the lesson's key takeaway?

• Avoid word problems

• Memorize all formulas

• Check if your answer is reasonable

• Always use a calculator