Least Common Multiple Practice for 11+ Maths: A Parent's Guide
19 October 2026
Why LCM matters in 11+ Maths
The least common multiple (LCM) is a core topic in both CEM and GL 11+ Maths exams. Children are often asked to find the LCM of two or more numbers, especially in word problems or questions involving multiples and patterns. Understanding LCM helps build confidence with number work and problem-solving.
What is the least common multiple
The LCM of two or more numbers is the smallest number that is a multiple of each. For example, the LCM of 4 and 6 is 12, because 12 is the smallest number that both 4 and 6 divide into evenly. This idea comes up in questions about timing, events, or arranging objects in groups.
Step-by-step LCM method
To find the LCM, list the multiples of each number until you find one they share. Alternatively, use prime factorisation: break each number into its prime factors, then multiply each factor the greatest number of times it appears in any list. Practising both methods helps children spot patterns and choose the quickest route in the exam.
Key insight: Encourage your child to check their answer by dividing the LCM by each original number. If there's no remainder, the answer is correct.
LCM and HCF: Linked but different
Many 11+ questions mention both LCM and HCF (highest common factor). While LCM finds the smallest shared multiple, HCF finds the largest shared factor. Practising both together helps children avoid confusion and strengthens their understanding of number relationships.
Making LCM practice stick
Mix LCM questions into everyday maths practice. Use real-life examples, such as finding when two events coincide or arranging items in equal groups. Interactive worksheets and instant marking, like those on EEZY BREEZY MATHS, can make practice more engaging and help track progress over time.
Key insight: Revisit mistakes together. Reviewing incorrect answers helps your child understand where they went wrong and builds lasting confidence.
