📋 Direction Card: How to Use Your Ruler

Follow these steps carefully before you begin measuring:

1️⃣ Place the zero end (0 cm) of your ruler exactly at the start of the line.

2️⃣ Keep the ruler straight and flat along the entire length of the line.

3️⃣ Look directly down from above — do not look at an angle.

4️⃣ Read the number where the line ends. Record in centimetres (cm).

5️⃣ If the line ends between two numbers, read to the nearest half centimetre (0.5 cm).

🔍 Control of Error Card

Use this checklist to check your own work:

  My ruler started exactly at 0 cm — not at the edge of the ruler.

  My ruler did not move or slip while I was measuring.

  I recorded the measurement to the nearest 0.5 cm.

  I wrote the correct unit (cm) after every measurement.

  I double-checked by measuring the line a second time.

💡 Tip for diverse learners: Use a coloured dot sticker to mark the start of each line before measuring!

📏 Part 1: Identify and Measure Lines

Use your ruler to measure each line segment below. Write the measurement on the blank. Then identify the type of line from the word bank.

Word Bank:   horizontal  |  vertical  |  diagonal  |  curved

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

Measurement: _________ cm     Type of line: _________________________

 

Measurement: _________ cm     Type of line: _________________________

 

Measurement: _________ cm     Type of line: _________________________

∿∿∿∿∿∿

My estimate: _________ cm     Measured length: _________ cm

💡 Differentiation tip: Use a piece of string to trace the curved line, then measure the string with your ruler.

Longest: Question _____     Shortest: Question _____

Difference in length: _________ cm − _________ cm = _________ cm

📐 Part 2: Calculate the Perimeter

Measure each side of the shapes below using your ruler. Add all the sides together to find the perimeter.

Remember: Perimeter = sum of all sides.   P = side + side + side + side

(Draw or trace a rectangle here if this is printed — measure each side with your ruler.)

Top: _______ cm    Bottom: _______ cm    Left: _______ cm    Right: _______ cm

Perimeter = _______ + _______ + _______ + _______ = _________ cm

(Draw or trace a triangle here if this is printed — measure each side with your ruler.)

Side A: _______ cm    Side B: _______ cm    Side C: _______ cm

Perimeter = _______ + _______ + _______ = _________ cm

Perimeter = _________ cm

💡 Differentiation tip: Use the formula P = 4 × side for a square.

🌟 Extension Activity (Advanced Learners)

Side measurements: _______ + _______ + _______ + _______ + _______ = _________ cm

🔍 Control of Error Card: Perimeter

Use this checklist to verify your perimeter calculations:

  I measured every side of the shape — I did not skip any.

  I added all the sides together correctly. I can check with a calculator.

  My answer is written in centimetres (cm).

  For a rectangle, I checked: the two long sides are equal and the two short sides are equal.

  For a square, I checked: all four sides are equal, and P = 4 × one side.

💡 Peer check: Swap with a partner and re-measure one shape each to confirm your answers match!

💭 Part 3: Reflect and Connect

💡 Differentiation note for teachers: For students needing support, provide a word bank, pre-drawn shapes with labelled sides, or allow use of a calculator for addition. For early finishers, assign the extension activity and challenge question above.