Let's solve the
"Measuring Length" worksheet step by step and explain how to read each measurement accurately.
---
🔍 Understanding the Ruler
- The metric ruler is marked in
centimeters (cm) and
millimeters (mm).
- Each
centimeter is divided into
10 millimeters.
- The
larger lines are centimeters; the
smaller lines between them are millimeters.
- To read a measurement:
- Identify the
nearest whole number (cm or mm).
- Count the small tick marks for precision.
- Remember:
$$
1\ \text{cm} = 10\ \text{mm}
$$
---
##
✔ Task 1: Measurement Reading – Length
---
🔹 Measurement A
Image: Ruler from 39 to 43 cm. Arrow points just
after 42 cm, at the
third small tick mark after 42.
#### Step-by-step:
- The arrow is
at 42 cm + 3 mm.
- So, total length =
42.3 cm.
- But we need to express it in
millimeters (mm).
Convert:
$$
42.3\ \text{cm} = 42.3 \times 10 = 423\ \text{mm}
$$
✔ A = 423 mm
> ⚠️ Note: Since the smallest division is 1 mm, we can read to the nearest mm. The third tick after 42 cm is 423 mm.
---
🔹 Measurement B
Image: Ruler from 0 to 10 cm, then 1 to 4 cm again. Arrow points
just before 6 cm, at the
8th small tick mark after 5 cm.
Wait — let’s clarify:
The arrow is pointing
between 5 and 6 cm, but closer to 6 cm.
Looking closely:
- It's at
5.8 cm.
- Because:
- 5 cm → full line
- Then 8 small ticks after that = 8 mm
- So: 5 cm + 8 mm = 5.8 cm
✔ B = 5.8 cm
> ✔️ This is already in
cm, so no conversion needed.
---
🔹 Measurement C
Image: Ruler from 93 to 99 cm. Arrow points
just after 96 cm, at the
second small tick mark after 96 cm.
So:
- 96 cm + 2 mm = 96.2 cm
- Convert to millimeters:
$$
96.2\ \text{cm} = 96.2 \times 10 = 962\ \text{mm}
$$
✔ C = 962 mm
---
##
✔ Final Answers:
| Measurement | Value |
|------------|--------|
| A = |
423 mm |
| B = |
5.8 cm |
| C = |
962 mm |
---
📝 Summary of Key Concepts:
- Always align the object with the zero mark (or use the reference point).
- Read the measurement at the
point where the arrow points.
- Use
mm for more precise readings when required.
- Remember:
$$
1\ \text{cm} = 10\ \text{mm},\quad 1\ \text{m} = 100\ \text{cm}
$$
---
✔ Answer Box:
```
A = 423 mm
B = 5.8 cm
C = 962 mm
```
Let me know if you'd like a printable version or explanation for students!
Parent Tip: Review the logic above to help your child master the concept of measurement worksheet grade 7.
