Free PDFGrade 4 · Math · 30 min
Rice cake geometry
Snap a round rice cake into halves, quarters and angles.
I can name parts of a circle and know that a quarter turn is 90 degrees.
A math video lesson with a free worksheet and answer key for teachers
About the video
In the video a round rice cake is snapped into halves, quarters and angles. At home 2 to 4 players and a caller use one rice cake each and a ruler to show 6 calls, from a semicircle to a full 360 degree turn. A full circle is 360 degrees, so a half has a straight edge of 180 degrees and a quarter has a right angle of 90 degrees at the centre. Three quarters together make 3/4 of the circle, which is 270 degrees.
What your child learns
- Name halves, quarters and three quarters of a circle
- Know that a quarter turn is 90 degrees
- Link straight angles and full turns to 180 and 360 degrees
What's on the worksheet
- 1Predict first
- 2Record your pieces
- 3What did you see?
- 4The math behind it
- 5Match the pieces
- 6Name the cake piece
- 7Count the degrees
- 8Which piece is bigger?
- 9Draw and label
You need
1 caller and 2 to 4 players. Each player: 1 round plain rice cake (about 10 cm across), 1 plate, 1 ruler. 2 spare rice cakes.
Safety
Wash your hands first and check the packet for allergies.
Tip for the adult
Let your child test the corner of a quarter against the corner of a sheet of paper to check it is a right angle.
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