What this lesson teaches
LCM and HCF.
Math in Action
LCM HCF with Blocks
Find LCM and HCF by making groups with blocks!
Duration30 min
Age GroupAges 8–11
DifficultyIntermediate
SubjectMath
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How the activity runs
The learning connection
LCM and HCF are fundamentally about grouping — a concept that only becomes clear when students physically arrange objects into sets and look for alignment. Abstract calculation of these values gives correct answers without understanding; block manipulation builds understanding before algorithms.
Try it with your learner
1. Take 12 blocks. 2. Group in 2s 3s 4s 6s. 3. Take 18 blocks. 4. Find common groupings.