Junior Cycle Higher Level Maths JCHL Number Theory

JCHL 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

Every formula from these lessons in one place. The green ones are printed in the log tables booklet you get in the exam — the red ones you learn off.

★ Must learn

Natural numbers (N)

The whole positive numbers 1, 2, 3, …

JCHL Number Theory 1

★ Must learn

Integers (Z)

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

JCHL 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.

JCHL 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.

JCHL Number Theory 1

★ Must learn

Real numbers (R)

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

JCHL Number Theory 1