Summary
Math Antics finds a common denominator by making equivalent fractions (the 'easy common denominator'). A clear, animated 5-minute lesson you can drop straight into a grades 4-5 math block -- pause-friendly, with worked examples on screen.
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All ages
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Teaching resources
Discussion questions
Discussion
A few questions to talk through after watching “Common Denominator (ECD).”
- Why do fractions need the same denominator before you add them?
- How do you make equivalent fractions with a common denominator?
- What is the quickest way to find a common denominator?
Quick work-a-long
Vocabulary: common denominator, equivalent fraction, multiply, denominator.
Try it: Rewrite 1/3 and 1/4 with a common denominator.