Let's solve the problem step by step based on the image you provided.
What is the task?
The image shows a yellow pencil placed above a ruler. The goal is to
measure the length of the pencil using the ruler.
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Step 1: Understand the ruler
- The ruler has markings in centimeters (cm), with each large number representing 1 cm.
- Between each centimeter, there are 10 smaller marks, which represent millimeters (mm).
- So, each small tick is 1 mm.
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Step 2: Identify the starting point
- The
tip of the pencil (the pointed end) is aligned with the
3 cm mark on the ruler.
> So, the measurement starts at
3 cm.
---
Step 3: Identify the ending point
- The
end of the pencil (the eraser side) reaches just before the
11 cm mark.
- Let's look closely:
- The pencil ends
between 10 and 11 cm.
- It appears to be
at the 9th small mark after 10 cm, which is
10.9 cm.
> So, the pencil ends at
10.9 cm.
---
Step 4: Calculate the length
To find the length of the pencil:
$$
\text{Length} = \text{End point} - \text{Start point}
$$
$$
= 10.9\, \text{cm} - 3.0\, \text{cm} = 7.9\, \text{cm}
$$
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✔ Final Answer:
The length of the pencil is 7.9 centimeters.
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🔍 Explanation:
Even though the pencil starts at 3 cm, we subtract that from the endpoint (10.9 cm) because we're measuring the distance it spans. This gives us the actual length of the object.
So,
7.9 cm is the correct length of the pencil.
Parent Tip: Review the logic above to help your child master the concept of measuring a pencil.
