2n ESO Notes 2026–27

Fractions

Class notes, taught in Catalan. Published section by section as the course goes on.

What a fraction is, numerator and denominator, and proper and improper fractions.

Placing a fraction on the real line and the symbols used to compare them.

Scaling a fraction up and simplifying it, and reaching the irreducible one through the gcd.

When two fractions are worth the same, the cross product and the missing term.

Solutions to exercises 5, 6 and 16: equivalence, unknown term and ordering.

The five steps for adding and subtracting fractions with different denominators.

Solutions to exercises 21 and 22: adding and subtracting with whole numbers and brackets.

Multiply straight across, divide crosswise or by the reciprocal, and fractions of fractions.

Solutions to exercises 22 i, 25 and 26: multiplying and dividing by factorising.

Power of a fraction, laws of exponents and the root of a fraction.

Exercises 31 a, c and 32 c, e: combined operations. Folded solutions.

What the exam covers and where to revise it.

Exercises 27, 29 and 34: powers, roots and combined operations.

Homework to prepare for the exam: one exercise per exam topic, with folded solutions.