3r ESO Notes 2026–27

Maths challenges

Class notes, originally in Catalan. Published challenge by challenge as the course goes on.

01 23 Sep 2026

Survival laboratory

Revising 2n ESO: base areas, volumes of prisms, cylinders and pyramids, litres, percentages and an equation.

02 21 Sep 2026

Homework corrected (21 Sep)

Prism, cylinder and pyramid: base area, lateral area, total area and volume in cm³ and litres.

03 23 Sep 2026

Homework: the swimming pool

For the next class: areas and volumes of a prism and a half-cylinder to work out the cost of painting and filling a pool.

04 25 Sep 2026

Renovating our first flat

Challenge B: wall and floor areas, perimeter and percentages to work out the cost of painting a flat and fitting parquet and skirting board. With solutions.

📥 PDF worksheets: the challenge problem sheets and the formula sheet →