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LessonMathematicsBeginner

The Number That Wouldn't Share — What is a prime number, and why can't you split it into equal rows?

A prime number is a number that can't be split into equal rows — it makes only a straight line, never a rectangle. Lay out festival seeds and discover it with your own hands: six and twelve fall into tidy rectangles, but seven leaves one seed over no matter how many rows you try. Meet the prime numbers — the loners that won't share, and the building blocks every other number is secretly made from.

11 min6 questionsGrades 3, 4, 5

VCreated byViafocus

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6 questions

first 4 shown

1Lay the six seeds in equal rowsInteractive
2Find a rectangle for twelveInteractive
3Seven is bigger than six. Six made a rectangle two ways — so seven has even MORE ways to share, right?