Word Problem Solving: Addition and Subtraction in Inches

This lesson focuses on solving word problems involving addition and subtraction of lengths using diagrams like number lines. It emphasizes identifying clue words to determine the correct operation. Examples include subtracting and adding ribbon lengths, finding equal rope lengths, and erasing part of a line. The lesson concludes with a reminder to read problems carefully and a preview of the next lesson on measuring objects.

What is the purpose of using a number line in solving word problems?

• To make the problem more complex

• To visually represent the problem and help in writing equations

• To confuse the solver

• To avoid using equations

Which of the following is a clue word for addition?

• Altogether

• Fewer

• Take away

• Difference

Sophia has a ribbon that is 14 inches long and cuts off a 5-inch piece. How long is the ribbon now?

• 9 inches

• 14 inches

• 19 inches

• 5 inches

What operation is used when the word 'removed' is mentioned in a problem?

• Addition

• Multiplication

• Subtraction

• Division

Tala has two ribbons, one 14 inches and another 7 inches. What is the total length of the ribbons?

• 21 inches

• 14 inches

• 7 inches

• 28 inches

Which word in a problem suggests that you should add the lengths together?

• Removed

• Fewer

• And

• Difference

Bob has two pieces of rope of equal length totaling 24 inches. How long is each piece?

• 14 inches

• 12 inches

• 10 inches

• 8 inches

If Sarah erases 8 inches from a 17-inch line, how long is the line now?

• 17 inches

• 8 inches

• 9 inches

• 25 inches

What does the word 'erased' indicate in a word problem?

• Addition

• Subtraction

• Multiplication

• Division

What should you do after solving a word problem to ensure accuracy?

• Ask someone else to solve it

• Move on to the next problem

• Check your work for mistakes

• Ignore the solution