Leaving Cert Ordinary Level Maths LCOL Number Theory

LCOL Number Theory

Your progress through this topic0 of 5 lessons

Lessons in this topic

All 5 lessons.

1Types of Numbers 2Prime Factorisation 3Rounding off and Scientific Notation 4Powers 5Surds

Key ideas in this topic

★ Must learn

Natural numbers (N)

The whole positive numbers 1, 2, 3, …

LCOL Number Theory 1

★ Must learn

Integers (Z)

All whole numbers — positive, negative and zero (…−2, −1, 0, 1, 2…).

LCOL Number Theory 1

★ Must learn

Rational numbers (Q)

Any number that can be written, in its simplest form, as a fraction a/b where a and b are integers and b ≠ 0 — this includes all integers and all terminating and recurring decimals.

LCOL Number Theory 1

★ Must learn

Irrational numbers

A number that CANNOT be written, in its simplest form, as a fraction a/b where a and b are integers and b ≠ 0 (e.g. √3, π) — its decimal never stops and never repeats.

LCOL Number Theory 1

★ Must learn

Real numbers (R)

All the rational and irrational numbers together — every number on the number line.

LCOL Number Theory 1