Why We Need Standard Units
Learners compare desks, ropes, cups, and water bottles using fair measuring units.
Why We Need Standard Units
Learners compare desks, ropes, cups, and water bottles using fair measuring units. Today they use the model to explain measurement in their own words.
Why We Need Standard Units illustration
Learners compare desks, ropes, cups, and water bottles using fair measuring units.
A desk is 6 paper strips long and a mat is 9 paper strips long. Which is longer?
- Use the same measuring unit from one end of each object to the other end.
- Compare the counts or units. The longer object is the mat.
Struggle support
Rescue lab
Why We Need Standard Units rescue model
Learners compare classroom objects with the same unit placed carefully from end to end.
Draw equal units touching end to end with no gaps and no overlaps.
Place the same unit along the object from one end to the other.
Every unit is the same size and touches the next unit.
Mark each unit with a tick so the measurement can be checked.
The picture shows a fair line of equal units.
Write the count with the unit name and compare the measurements.
9 paper strips is longer than 6 paper strips when the strips are equal.
The learner leaves gaps between units and gets a measurement that is too small.
Ask the learner to rebuild the model slowly and say what each part means.
Move the units so they touch end to end, then count the units again.
The learner gives an answer without connecting it to the objects.
Cover the written answer and ask the learner to point to the matching part of the model.
Return to the concrete objects, then redraw the same idea before writing the answer again.
Measure one object again with careful units and compare it with a partner result.