Primary 4 covers the multiplication algorithm up to 4 digits by 1 digit and up to 3 digits by 2 digits, and the division algorithm up to 4 digits by 1 digit.
What the four operations actually asks of a Primary 4 student
Two-digit multiplication is the hardest procedural skill in primary mathematics. It requires two rounds of multiplying, a placeholder zero in the second row, and then an addition — several things to hold at once.
Long division is close behind, because it cycles through divide, multiply, subtract, bring down, and a child who forgets which step comes next produces nonsense rather than a near miss.
Both are pure execution. The mathematics is understood; the marks depend on carrying it out without slipping.
What the syllabus covers
Under the MOE primary mathematics syllabus, the four operations at Primary 4 covers:
- multiplication algorithm up to 4 digits by 1 digit and up to 3 digits by 2 digits
- division algorithm up to 4 digits by 1 digit
Where the marks actually go
The missing placeholder zero in the second row of a two-digit multiplication. The answer ends up roughly a tenth of what it should be.
In long division, forgetting to bring the next digit down, or omitting a zero in the quotient when the divisor does not go into a digit.
Column misalignment, which at four digits changes the answer by thousands and is invisible in messy work.
How to practise this properly
Insist on squared paper or ruled columns. Most long-multiplication errors are alignment errors wearing a disguise.
Say the steps of long division aloud in order while working. The rhythm is what keeps the cycle intact.
Estimate first. If 312 × 24 is roughly 300 × 25, an answer near 7 500 is plausible and one near 750 is not.
Check division by multiplying back. It takes seconds and catches almost everything.
What this leads to
Primary 5 uses these algorithms inside multi-step word problems, where the arithmetic is a step rather than the task. Fluency here is what leaves attention available for the reasoning.
This is why we teach the primary years as one arc rather than six separate ones. Our MOE-aligned curriculum runs from Primary 1 to Primary 6, so when something goes wrong we can trace it to the year it actually formed and repair it there, instead of drilling the level where it happens to be showing up. That distinction usually decides whether extra work produces improvement or simply produces more work.
What lessons at Odyssey are actually like
A student on how the lessons work in practice. The clip is from our secondary classes, but the way concepts are explained is the same at every level. 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 first lesson is a free trial, and it is a diagnosis rather than a sales pitch: we would rather tell you what is actually wrong than sign you up. If the answer is that your child does not need tuition yet, we will say so. Book a free trial class 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
Why does my child forget the zero in long multiplication?
Because it looks like it does nothing. Explaining that the second row is multiplying by tens, not units, gives the zero a reason and makes it memorable.
What sizes of numbers are covered?
Multiplication up to 4 digits by 1 digit and 3 digits by 2 digits; division up to 4 digits by 1 digit.
Should my child learn to check their work?
Yes, and multiplying back after a division is the most efficient check available at this level.
Is long division still taught?
Yes, the division algorithm is specified in the syllabus at Primary 4.
