Sorting and Classifying — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A big red circle is big, red, and a circle.
Circles are perfectly round with no corners, naming the shape attribute in the sort.
2. Sorting by color, size, and shape uses three attributes.
Color, size, and shape together count to three, so the sort uses three attributes total.
3. A small blue square fits the small AND blue overlap.
Both small and blue match, so the item belongs in the shared overlap of two circles.
4. A yellow item that is not big goes in the yellow but not the big circle.
Small items do not match the big rule, so they stay outside the big circle on the Venn.
5. A Venn diagram shows when items belong to two groups.
Venn diagrams use two circles to show items that match one rule, the other, or both.
6. Big, small, and medium are size words.
Big, small, and medium describe size, the attribute that tells how large an item is.
7. A red triangle is red and a triangle.
Triangles have three sides and three corners, so the shape attribute names it a triangle.
8. Items matching no rules go outside the Venn diagram.
Items matching no rules belong outside both circles since they fit none of the sort groups.
9. Color, size, shape: these are sorting rules.
Each attribute gives a way to group items, so they act as rules for sorting decisions.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Big AND red square
→ Goes in big-red overlap
Goes in big-red overlap
Small only, not red
→ Stays in small circle
Stays in small circle
Red only, not big
→ Stays in red circle
Stays in red circle
Tiny green circle
→ Goes outside both
Goes outside both
Each item matches different rules, so deciding the zone shows three-attribute Venn thinking.