2-D representations of 3-D objects on triangular dotty paper Student activity Play

Acids (1) Whiteboard exercise Play

Acids (1) Student activity Play

Finding the nth term of a sequence Whiteboard presentation Play

Finding the nth term of a sequence Class activity Play

Molecules with five or six covalent bonds Student activity Play

Names of prisms Animation Play

Phosphorus pentachloride molecule Animation Play

Prisms Student activity Play

Sulphur(VI) fluoride (or hexafluoride) molecule Animation Play

Surface area of a prism Student activity Play

Surface area of a triangular prism Animation Play

The nth triangular number Animation Play

Triangular and square numbers Class activity Play

Triangular and square numbers Whiteboard presentation Play

Triangular and square numbers Student activity Play

Triangular and square numbers Animation Play

Triangular numbers Student activity Play

Triangular numbers Animation Play

Triangular numbers Whiteboard exercise Play

Triangular numbers Student activity Play

Triangular numbers, squares, roots Student activity Play

Triangular numbers, squares, roots Animation Play