Understanding Bar Models in Word Problems

The video tutorial teaches how to solve a length word problem using bar models. It begins with a problem about combining two pieces of fabric, one 75 cm long and another 12 cm shorter. The lesson explains bar models with a worm example, highlights common misunderstandings in word problems, and guides viewers through drawing and solving the bar model for the fabric problem. The solution involves calculating the length of the second fabric piece and combining both to find the total length.

What is the length of the first piece of fabric the girl has?

• 12 cm

• 87 cm

• 75 cm

• 63 cm

How much shorter is the second piece of fabric compared to the first?

• 8 cm

• 10 cm

• 15 cm

• 12 cm

In the bar model example, how far did the worm crawl in total?

• 23 cm

• 41 cm

• 36 cm

• 18 cm

What is a common mistake when solving word problems?

• Using a calculator

• Relying solely on keywords

• Ignoring the numbers

• Drawing a bar model

What is the first step in creating a bar model?

• Draw the bars

• Understand the problem

• Add the numbers

• Solve the problem

How do you represent the 12 cm difference in the bar model?

• By drawing a longer bar

• By writing 12 in the empty space

• By ignoring it

• By adding 12 to the first bar

What operation is used to find the length of the second piece of fabric?

• Division

• Multiplication

• Subtraction

• Addition

What is the length of the second piece of fabric?

• 12 cm

• 75 cm

• 63 cm

• 87 cm

What is the total length of the fabric when both pieces are combined?

• 120 cm

• 100 cm

• 150 cm

• 138 cm

What did you learn in this lesson?

• How to calculate area

• How to sew fabric

• How to draw a bar model

• How to solve a length word problem using a bar model