Measuring Length with Decimals
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Measuring Length with Decimals
📏 About Estimation and Measurement
Estimation is making a sensible guess about how long something might be before you measure it. Measurement is using a ruler to find the exact length.
When measuring with a ruler, remember to:
- Start measuring from the 0 mark
- Look carefully at the centimetre and millimetre marks
- Record your answer as a decimal (e.g., 7.3 cm instead of 7 cm 3 mm)
- Keep your eye level with the ruler for accuracy
📋 Measuring Activity
Instructions: Find the following objects around your classroom or home. First, estimate how long you think each object is in centimetres. Write your estimate in the table. Then use a ruler to measure the actual length and record it as a decimal in both centimetres (cm) and millimetres (mm).
| Object | Estimated Length (cm) | Actual Length (cm) | Actual Length (mm) |
|---|---|---|---|
| Pencil | |||
| Paperclip | |||
| Eraser | |||
| Your hand span | |||
| Book (width) | |||
| Spoon |
🤔 Reflection Questions
a) 5.2 cm = _______ mm
b) 12.7 cm = _______ mm
c) 8.5 cm = _______ mm
For example, if your measurement is 7.5 cm, then:
7.5 cm = 7.5 x 10 = _______ mm
About This Worksheet
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