HTML5 Collection for Primary Mathematics

GeoGebra Institute of Hong Kong

Tablet-friendly HTML5 applets for the teaching of primary mathematics.


  • 1. Telling time from clocks
  • 2. Find the Elapsed Time using 'Hours & Minutes'
  • 3. Constructing Quadrilaterals by Four Sides (2014)
  • 4. Classifying Quadrilaterals
  • 5. Drawing quadrilaterals on the grid or the pinboard
  • 6. Measuring Angles Using Protractor
  • 7. Comparing Size by Cut and Paste
  • 8. Area of Rectangles and Squares
  • 9. Variety of Perimeters with Fixed Area
  • 10. Variety of Areas with Fixed Perimeter
  • 11. Area of Parallelograms
  • 12. Fraction Multiplication
  • 13. Fraction Division1:　a ÷ b (Partitive)
  • 14. Fraction Division3:　a ÷ b (Quotitive)
  • 15. Fraction Division4:　1 ÷ a/b (Quotitive)
  • 16. Diagonal Problem (Manual Counting)
  • 17. Percentages: Selling Problems, Profit & Loss
  • 18. Circumference of Circles
  • 19. Chinese Match Puzzles 1 (8 puzzles)
  • 20. Chinese Match Puzzles 2 (7 puzzles)

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Telling time from clocks

Drag the slider and click the ＋ and － buttons to set the clocks. Tell the time from the clocks.[br][br]Check the boxes to show the time, the clock face and the digital clock.
Telling time from clocks
Anthony OR. GeoGebra Institute of Hong Kong.
– Anthony OR 柯志明

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