Grade 1 › G1U09 2-D Shapes

Grade 1 › G1U09 2-D Shapes › L2
GRADE 1 · ALBERTAOUTCOME AB-G1-1G1

L2 · Sorting 2-D shapes by one rule

Learning goal

“I can sort shapes by one rule, and I can say my rule.”

Sort — to put things into groups that go together.
Rule — the one idea you use to make the groups.
Group — a set of things that go together by the rule.
Worked example

Four shapes: a triangle, a square, a rectangle, and a circle. My rule: sort by number of sides. Step 1: Count each shape's sides. Triangle: 3. Square: 4. Rectangle: 4. Circle: no straight sides. Step 2: Make the groups. 3 sides: the triangle. 4 sides: the square and the rectangle. No straight sides: the circle. Step 3: Say the rule out loud: "I sorted by number of sides." Say it plainly: a sort is not finished until you can say your rule.

Check yourself — explain it

Why does the circle get its own group?

Paired problem — example still visible

The rule is: sort by number of corners. A triangle and a rectangle - which group does each one join: 3 corners or 4 corners? -> The triangle joins 3 corners; the rectangle joins 4 corners

Faded completion — last step is yours

"Sort by corners: the triangle (3 corners) goes in the '3 corners' group. The square (4 corners) goes in the '___ corners' group." -> 4

Ready to practise?

8 scored questions with a 3-rung hint ladder. Mastery needs 7/8 plus both gate questions.

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