Ages 9–10🧮 MathematicsBeing planted

Prime numbers

Know and use the vocabulary of prime numbers, prime factors, and composite numbers; establish whether a number up to 100 is prime; recall prime numbers up to 19

A first look

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Question 1 of 3

Which statement correctly tells whether 51 is a prime or composite number and why?

Question 2 of 3

Liam has 91 stickers and wants to arrange them into equal piles with no stickers left over. To decide if 91 can be split into piles other than one pile or 91 piles, he needs to know if it is prime or composite. Which statement correctly tells whether 91 is prime or composite and why?

Question 3 of 3

Maya is making a secret code that must contain every prime number that is smaller than 20. Which set lists exactly the numbers she should use?

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Skill names and descriptions include the Marble Skill Taxonomy © Generative Spark, Inc. (withmarble.com), licensed under ODbL 1.0 (database) and CC BY-SA 4.0 (content). Practice questions are GlowGrades's own, each checked by independent verifiers that must agree before a child ever sees it.