Lesson · Grade 2 · Mathematics
Sorting Shapes by Two Rules
- Grade 2
- Mathematics
- 58 s
- British Columbia
- BC2-MA-18
Six red and blue triangles, squares, rectangles and circles are sorted one at a time into a grid of four boxes, using two rules at once: colour (red or blue) and corners (corners or no corners). Each box is counted, 2 + 1 + 2 + 1 = 6 checks that every shape was sorted, and the video ends by naming the sorting rule, colour and corners, so each shape must match both rules.
Concept: Sorting shapes by two attributes
Anyone can watch two lessons on the website without an account. Signing in is free, no payment and no card, and opens three a day; Plus has no limit.
Loading
In one sentence
The question this lesson answers
Let's sort these shapes using two rules.
Rule one is colour: red or blue.
Transcript
What the lesson says
Let's sort these shapes using two rules.
Rule one is colour: red or blue.
Rule two: corners or no corners.
This box is for red shapes with corners.
This triangle is red, with three corners.
This circle is blue, with no corners.
Now sort the rest, checking both rules.
Count each box: two, one, two, one.
Two plus one plus two plus one makes six shapes.
Our sorting rule is colour and corners.
Two rules: each shape must match both.
Curriculum
Where this fits
- British Columbia, Grade 2
Mathematics, Geometry and measurement: multiple attributes of 2D shapes and 3D objectsBC2-MA-18
Previous: Centimetres or Metres? Fingertips and Giant StepsNext: The Flat Faces of a Cube and a Cylinder
The outcomes and strands follow the British Columbia curriculum.
Keep going
1 min 12 s3:15 p.m. or 15:15? Morning, afternoon and the 24-hour clock
Grade 4 · 1 min 12 s
1 min 26 s3D Objects: Faces, Edges and Vertices
Grade 3 · 1 min 26 s
1 min 21 sArea and Perimeter: What Is the Difference?
Grade 5 · 1 min 21 s
1 min 5 sArea of a Circle from the Radius or the Diameter
Grade 7 · 1 min 5 s
1 min 14 sArea of a Parallelogram: Cut and Slide into a Rectangle
Grade 6 · 1 min 14 s
1 min 18 sArea of a Rectangle: Count the Squares, Then Multiply
Grade 5 · 1 min 18 s
1 min 16 sArea of a Trapezoid: Two Copies Make a Parallelogram
Grade 6 · 1 min 16 s
1 min 19 sArea of a Triangle: Half of a Parallelogram
Grade 6 · 1 min 19 s
- All Grade 2 Mathematics lessons
- Teachers: the maths worksheets for Grade 2 are in the dashboard, each with a worked example and a proven answer key.
- Try the graph paper, free for everyone, no account needed.
- Create a free account to watch three lessons a day, no payment and no card.