Primary 4 covers factors, multiples and their relationship, determining whether a 1-digit number is a factor of a number within 100, finding common factors of two numbers, determining multiples, and finding common multiples of two 1-digit numbers.
What factors and multiples actually asks of a Primary 4 student
Factors and multiples are two views of the same relationship, and children confuse them constantly. If 3 is a factor of 12, then 12 is a multiple of 3 — one statement, read from either end.
The topic depends entirely on times-table fluency. A child still calculating 7 × 8 cannot search for factors efficiently, so weakness here is often a Primary 3 problem surfacing rather than a new one.
Common factors and common multiples are the first time a child works with two numbers at once and looks for what they share — the thinking that becomes HCF and LCM at secondary level.
What the syllabus covers
Under the MOE primary mathematics syllabus, factors and multiples at Primary 4 covers:
- factors, multiples and their relationship
- determining if a 1-digit number is a factor of a given number within 100
- finding the common factors of two given numbers
- determining if a number is a multiple of a given 1-digit number
- finding the common multiples of two given 1-digit numbers
Where the marks actually go
Swapping the two words. Asked for factors of 12, the child lists 12, 24, 36 — the multiples.
Incomplete factor lists, usually missing 1, the number itself, or the pair partway through.
Common multiples listed without checking both numbers, so a number that is a multiple of one but not the other slips in.
How to practise this properly
Fix the vocabulary with one sentence: factors divide into it, multiples come out of it. Repeat it until the child says it back automatically.
Find factors in pairs. Start at 1 × the number and work inwards; the list is complete when the pairs meet, and nothing gets missed.
For common multiples, list a few of each and circle the shared ones rather than trying to spot them mentally.
Practise with numbers whose factors are not obvious, such as 36 or 48, where a systematic search actually matters.
What this leads to
Primary 5 and 6 fraction work depends on finding common denominators, which is common multiples under a different name. At secondary level this becomes HCF, LCM and prime factorisation.
Mathematics at primary level does not reset each year, so neither does our teaching. The same MOE-aligned curriculum runs from Primary 1 to Primary 6, which means we can tell the difference between a child who has not met an idea and one who met it and never secured it. Those two situations look identical on a worksheet and need completely different responses.
What lessons at Odyssey are actually like
Here is a student talking about what studying with us is actually like. She is at secondary level; the teaching method is the one we use throughout, adjusted to the age. More are on Odyssey Math TV.
Getting help with this topic
We teach Primary 4 maths in small classes at Hexacube, 160 Changi Road #01-02, about three minutes from Eunos MRT. You can see our class schedules and fees, read about our math tutors, or look through the primary school math tuition programme as a whole. If your child is in a nearby school, our primary school directory may be useful too.
The trial lesson is free and diagnostic. You will leave knowing what we think the cause of the difficulty is and what we would do about it, whether or not you go on to enrol. That seems a fairer basis for a decision than a brochure. Arrange one or WhatsApp +65 8512 6882.
What we describe here comes from teaching this syllabus in our own classes since 2012. It is not a forecast for any individual child: progress is produced jointly, by a student willing to do the work with support at home. We do not promise grades. Topics follow the MOE primary mathematics syllabus — check the current syllabus on the MOE website for the definitive version, and see our curriculum page for how we teach it.
Frequently asked questions
What is the difference between a factor and a multiple?
A factor divides into a number exactly; a multiple is what you get when you multiply. 3 is a factor of 12, and 12 is a multiple of 3.
How do you find all the factors without missing any?
Work in pairs from 1 upwards. When the pairs start repeating, the list is complete.
Does Primary 4 cover prime numbers?
Primes are not named in the Primary 4 syllabus content; factors and multiples are. Prime factorisation comes at secondary level.
Why does my child struggle with this topic?
Usually because times tables are not yet automatic. Searching for factors requires instant recall, so the difficulty is often inherited from Primary 3.
