Measure using a centimeter ruler
key points :
🔹 What is a centimetre (cm)?
- A centimetre is a unit used to measure length.
- It is written as cm.
- Example: A pencil may be 10 cm long.
🔹 Know your ruler
- A ruler has numbers starting from 0.
- Each small line shows 1 centimetre.
- Longer lines help you count easily.
🔹 Start from zero
- Always place the object at the 0 mark, not at the edge of the ruler.
🔹 Keep it straight
- The object and ruler should be in a straight line.
🔹 Read the number at the end
- Look at where the object ends.
- The number there tells the length in centimetres.
🔹 Example
- If a crayon ends at 8, its length is 8 cm.
✏️ Simple Steps
1️⃣ Place the object at 0
2️⃣ Hold the ruler straight
3️⃣ Look at the end point
4️⃣ Read the number
🎯 Tips for Students
✅ Do not leave gaps between object and ruler
✅ Do not start from number 1
✅ Measure small objects like erasers, pencils, books
🎲 Fun Activity
Measure 3 things in your classroom:
- Pencil ✏️
- Eraser
- Book 📘
Write their lengths in cm
Learn with an example
💎 Move the ruler to measure the length of the line to the nearest centimeter.
💎 The line is about _____centimetres long.
- Line up the left end of the line with the 0 mark on the ruler.
- The right end of the line is at the 3-centimeter mark. The line is about 3 centimeters long.
💎 Move the ruler to measure the length of the line to the nearest centimeter
💎 The line is about _____ centimeters long.
- Line up the left end of the line with the 0 mark on the ruler.
- The right end of the line is at the 9-centimetre mark. The line is about 9 centimeters long.
💎 Move the ruler to measure the length of the line to the nearest centimeter.
💎 The line is about _____ centimetres long.
- Line up the left end of the line with the 0 mark on the ruler.
- The right end of the line is at the 4-centimetre mark. The line is about 4 centimeters long.
Let’s practice!🖊️
