Least Common Multiple Practice for 11+ Maths: Calm Guidance for Parents
19 October 2026
Understanding least common multiple
The least common multiple (LCM) is the smallest number that is a multiple of two or more numbers. For 11+ Maths, children are expected to identify the LCM to help with topics like fractions, word problems, and ratio.
How to find the LCM
Start by listing the first few multiples of each number. For example, for 4 and 6: the multiples of 4 are 4, 8, 12, 16, 20, and so on. The multiples of 6 are 6, 12, 18, 24, and so on. The first number that appears in both lists is the LCM. In this case, 12.
Practical practice at home
Encourage your child to practise with pairs of numbers, starting small (like 3 and 5) and building up to larger numbers. Use paper or a whiteboard to list out the multiples, then circle the lowest common one. As confidence grows, try finding the LCM for three numbers.
Key insight: Mistakes are learning opportunities
If your child misses a common multiple or chooses the wrong number, use it as a chance to talk through the lists together. Revisiting mistakes helps children strengthen their understanding and build confidence.
Supporting steady progress
Regular short practice sessions help LCM skills become automatic. Link LCM questions to real-life situations, such as finding when two events will happen at the same time, to make practice meaningful and memorable.
