Understanding that objects need to be straight in order to compare them accurately; selecting an appropriate unit of measure
The focus of Challenge is for the children to think about the importance of objects being straight in order to compare them accurately and to introduce the idea of selecting an appropriate unit of measure.
Provide children with sets of three different lengths of ribbon or rope like in the challenge picture. Ask them to make their own baseline to compare and order them by length, shortest to longest.
Measure using non-standard measure (pasta, hands, counters, cubes, stones etc.)