Maths guides for parents

Short, worked explanations of the topics children ask about at the kitchen table, with the mistakes to watch for and a free video lesson for each. Written for parents, useful for teachers.

What are prime factors? A guide for parents

Factors, primes, factor trees and why every number has exactly one set of prime factors. With the three mistakes children make most often.

HCF and LCM: the quick way with prime factors

Highest common factor and lowest common multiple from one pair of factor trees, how to tell which one a word problem wants, and a check that catches most slips.

Divisibility rules from 2 to 12, and why they work

Quick tests for every number up to 12, including the rarely taught ones for 7 and 11, with one number worked all the way through.

Want the full course? Myriora Maths has short, free animated lessons from first numbers to 11+ problem types, with no ads and no sign-up.