Cross-multiplication Student activity Play

Cross-multiplication Whiteboard exercise Play

Equality of two ratios: proportion Whiteboard exercise Play

Equality of two ratios: proportion Whiteboard exercise Play

Equality of two ratios: proportion (1) Student activity Play

Equality of two ratios: proportion (2) Student activity Play

Equation in the form of a proportion Animation Play

How do we calculate x? Animation Play

How much time is needed? Student activity Play

More difficult problem involving proportion Student activity Play

More difficult problem involving proportion Whiteboard exercise Play

Problems involving proportion Student activity Play

Problems involving proportion Whiteboard exercise Play

School history competition Whiteboard exercise Play

School maths competition Whiteboard exercise Play

Solving equations in the form of a proportion Student activity Play

The equality of two ratios Animation Play

The time needed to paint 17 rooms Animation Play