Measuring Length with Scaled Instruments
Year 4 Mathematics Learning to measure accurately Using the right tools for the job
What is Length?
Length is how long something is We can measure different parts of objects Height - how tall something is Width - how wide something is Distance - space between two points
Think About This...
Look around the classroom What would you use to measure: • The length of your pencil? • The height of the door? • The distance across the playground?
Rulers - Perfect for Small Objects
Usually 30cm long Great for measuring pencils, books, small objects Has centimetre and millimetre marks Always start measuring from the zero mark Keep the ruler straight and flat
Ruler Practice Activity
Work with a partner Find 5 small objects in the classroom Measure each object with a ruler Record your measurements in centimetres Compare your results with other pairs
Tape Measures - For Bigger Jobs
Can extend much longer than rulers Perfect for measuring furniture, rooms, people Flexible - can measure curved objects Usually marked in metres and centimetres Always check the tape is straight
Choosing the Right Tool
{"left":"Small objects (pencils, erasers, books)\nMedium objects (desks, people, doors)\nRuler - up to 30cm\nTape measure - metres long","right":"Quick and easy to use\nMore flexible and longer\nVery accurate for small things\nBetter for larger measurements"}
Let's Measure Together!
We've learned about rulers and tape measures Remember to choose the right tool for the job Always start from zero Keep your measuring tool straight Practice makes perfect! Next time: We'll explore trundle wheels for very long distances