Grade 3 · Unit 9: Data representation and interpretation

Sorting diagrams

Venn and Carroll diagrams.

Sorting animals

Scientists sort animals by what they have in common. Mathematicians sort numbers the same way. The rules are called criteria.

Venn diagrams

Numbers in the intersection fit both rules. 6, 12 and 18 are even AND multiples of 3. Numbers outside both circles fit neither.

Carroll diagrams

A Carroll diagram has four boxes. Each number goes in one box. Compare it with the Venn diagram.

Tree diagrams for sorting

Sorting trees ask yes/no questions. Each answer leads to another question. Scientists use sorting trees (keys) to name living things.

What I learnt

• I can sort with Venn and Carroll diagrams.
• I can use sorting trees.