What Are Prime Numbers and How Do They Work

What Are Prime Numbers and How Do They Work?
What Are Prime Numbers and How Do They Work?

About Prime Numbers

Prime numbers are typically taught and tested at the Primary School level in Singapore, particularly under the Primary 5 and Primary 6 Mathematics syllabus.

PSLE Math Syllabus 

What is a Prime Number?

A prime number is a whole number greater than 1 that has exactly two factors: 1 and itself. This means it cannot be divided evenly by any other number. For example:

  • 2 is prime because it can only be divided by 1 and 2.

  • 3 is prime because only 1 and 3 divide it evenly.

  • 4 is not prime because it can be divided by 1, 2, and 4 (more than two factors).

 

So, in simple terms:

A prime number is like a number that refuses to be broken into smaller equal groups (except 1 group or itself).

How Prime Numbers Work:

  1. Starting from 2: 2 is the smallest and only even prime number.

  2. As numbers increase, check whether they can be divided evenly (no remainder) by any number other than 1 and itself.

  3. If not, the number is prime!

Examples of Prime Numbers:

  • 2, 3, 5, 7, 11, 13, 17, 19, 23, 29…

Is Prime Number tested in the Secondary or JC Syllabus

After Primary School, it is less often that we hear of the term “prime numbers” because of more complex topics such as Algebra or Graphing Techniques. However, some of the other topics are still tested based on the basics of prime numbers! 

  • In Secondary Math, prime numbers appear in topics like HCF (Highest Common Factor) and LCM (Lowest Common Multiple) using prime factorisation.

  • In JC-level Mathematics, especially in H2 Math, prime numbers become relevant in number theory or modular arithmetic.

    For example, Euler’s theorem and Fermat’s Little Theorem rely on the understanding of coprime numbers—which involves knowing about prime factors. While not part of the main syllabus for all, such knowledge is crucial in enrichment tracks like Math Olympiad or Computer Science.

 

Math Tuition

Lastly, before we end off with the topic on Prime numbers, If you’re finding it tough to understand Math topics, falling behind, or just need urgent help catching up—especially during this June holiday period when exams are drawing near—SequoiaVision Math Tuition is here to support you. (Now is a crucial time period to prepare and gear up for the examinations!)

Our patient and understanding tutors focus on helping you build confidence and clarity without unnecessary pressure. Whether you’re revising or starting from scratch, our lessons are designed to help you improve at your pace while staying exam-ready.

 

 

About TheSequoiaVision

At TheSequoiaVision, we’re passionate about making math fun and accessible for everyone! Whether you’re in Primary School, Secondary School,, or preparing for your JC H2 math, we’ve got the perfect support system for you. With teachers who are math experts with strong teaching experience, be prepared to excel with us through our proven track record!

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