PRIMARY 4 MATHEMATICS

Make Primary 4 count — the last year before the Primary 5 step-up.

Weekly live online classes for Primary 4 students in Singapore, paired with targeted practice that consolidates this year's fluency and prepares the thinking habits Primary 5 will reward.
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What we cover

Primary 4 is the last year of consolidation before the Singapore primary syllabus intensifies. Students extend numbers to 100,000, work with multiplication by 2-digit numbers and division by a 1-digit divisor, meet mixed numbers and improper fractions, learn fraction addition and subtraction with related denominators, work with decimals to 4 decimal places (multiplying and dividing by 10, 100, 1,000), find the area of rectangles and squares, work with factors and multiples, read line graphs, calculate averages, and build the model-drawing skills that PSLE Paper 2 problems will demand. DeepThink covers the full syllabus, deliberately bridging into Primary 5 ratio, percentage, and rate in the second half of the year.

Chapter 1: Numbers to 100 000

Counting, Reading and Writing Numbers

Ten Thousands, Thousands, Hundreds, Tens and Ones

Comparing and Ordering Numbers

Number Patterns

Rounding Numbers to the Nearest 10

Rounding Numbers to the Nearest 100

Rounding Numbers to the Nearest 1000

Chapter 2: Factors and Multiples

Factors

Common Factors

Multiples

Common Multiples

Chapter 3: Four Operations of Whole Numbers

Multiplication by 1-Digit Number

Multiplication by 2-Digit Number

Division by 1-Digit Number

Word Problems

Chapter 4: Tables and Line Graphs

Tables

Line Graphs

Chapter 5: Fractions (I)

Mixed Numbers

Improper Fractions

Mixed Numbers and Improper Fractions

Comparing and Ordering Fractions

Chapter 6: Fractions (II)

Addition and Subtraction of Fractions

Word Problems

Fraction of a Set

Word Problems

Chapter 7: Angles

Naming Angles

Measuring Angles

Drawing Angles

Chapter 8: Rectangles and Squares

Properties of Rectangles and Squares

Drawing Rectangles and Squares

Chapter 9: Decimals

Tenths

Hundredths

Thousandths

Comparing and Ordering Decimals

Number Patterns

Rounding Decimals

Expressing a Fraction as a Decimal

Expressing a Decimal as a Fraction

Chapter 10: Four Operations of Decimals

Addition of Decimals

Subtraction of Decimals

Word Problems

Multiplication of Decimals (by 1-digit Number)

Division of Decimals (by 1-digit Number)

Word Problems

Chapter 11: Pie Charts

Pie Charts

Chapter 12: Area and Perimeter

Finding the Length of Squares

Finding Unknown Sides of Rectangles

Perimeter of Composite Figures

Area of Composite Figures

Word Problems

Chapter 13: Nets

Geometric Figures

Drawing Geometric Figures on Isometric Grids

Identifying Nets of Geometric Figures

Chapter 14: Symmetry

Symmetric Figures and Lines of Symmetry

Completing Symmetric Figures on Grids

Primary 4 is also the year Subject-Based Banding decisions begin to take shape, with most Singapore schools using year-end results to recommend Standard or Foundation Mathematics for Primary 5. The Primary 5 step-up rewards students who arrive with secure fractions, decimals, and bar-model habits, which makes Primary 4 the most strategic year of the lower-primary phase.

Common challenges at this level

Primary 4 students often face:

Multi-step word problems with mixed topics

Primary 4 word problems combine fractions, whole numbers, and early ratio thinking in a single question. Students must plan a solution path before computing — a skill many have not yet practised.

Fluency between decimals, fractions, and percentages

Working fluidly between decimals (to 4 dp), fractions, and percentages is expected by Primary 4. Students who treat these as separate topics struggle when problems mix them.

Bar models with fractions

Bar models now have to represent fractional parts of a whole, which is much harder than partitioning into equal whole-number units. Students who skipped clean bar-model practice in Primary 3 hit a wall here.

Abstract geometry and properties

Geometry moves beyond naming shapes to reasoning about angles, symmetry, and properties of squares, rectangles, and triangles. Students need to connect visual intuition with mathematical rules.

Pressure of Subject-Based Banding decisions

Many Singapore primary schools use Primary 4 year-end results as the main input into Standard vs Foundation Math placement for Primary 5. The stakes feel real to parents and students for the first time.

Compounded gaps from Primary 1–3 are now expensive

Unresolved weaknesses in fractions, multiplication facts, or model drawing become serious obstacles in Primary 4 — and disastrous in Primary 5. Primary 4 is the last realistic window to fix them without compromising new content.

Computational accuracy under fatigue

Longer SA papers test stamina as much as ability. Students who can solve any single question often lose marks on long papers because of late-paper careless errors.

How DeepThink helps Primary 4 students

DeepThink prepares Primary 4 students for both the termly Weighted Assessment and year-end SA2 cycle and the Primary 5 step-up:

Fraction and decimal fluency

Mixed-number arithmetic, fraction-decimal conversion, and decimal multiplication and division are drilled until they are automatic — because Primary 5 percentage and ratio assumes this fluency.

Bar models that actually scale

Students learn the bar-model patterns that solve fraction-of-whole and comparison problems cleanly, so they enter Primary 5 ratio and percentage with the right visual habits.

Word-problem strategy, not just computation

Lessons coach students through reading the question, sketching a model, planning the steps, then computing — instead of jumping straight to numbers.

Targeted gap-closing from Primary 1–3

Online practice surfaces specific weak skills (a forgotten table, a fraction misconception, a model-drawing habit) and works on them in parallel with current Primary 4 content.

SA-style timed practice

Mixed-topic timed practice that mirrors Primary 4 Weighted Assessment and SA2 paper structures builds exam stamina and the discipline to check work before submitting.

Primary 4 is the most strategic year of the lower-primary phase. Decisions made now about whether to firm up foundations directly shape Primary 5 outcomes.

Program facts

What families should know about Primary 4 support

The details parents usually want before deciding whether to book a trial.

Lesson format

Weekly 1.5-hour live online class

Targeted online practice with instant marking supports work between lessons.

Syllabus focus

MOE Primary Mathematics

Full curriculum and chapter list shown in the syllabus section above.

Pricing

$30 per live class

Same fee across levels and streams.

Trial

Free trial class available

Parents can see the teaching pace, structure, and student experience before committing.

Best fit

Students in Primary 4 who need stronger foundations and calmer weekly revision.

Decision support

When Primary 4 support is the right fit

These are the situations where extra support tends to make the biggest difference.

Multi-step word problems with mixed topics

Primary 4 word problems combine fractions, whole numbers, and early ratio thinking in a single question. Students must plan a solution path before computing — a skill many have not yet practised.

Fluency between decimals, fractions, and percentages

Working fluidly between decimals (to 4 dp), fractions, and percentages is expected by Primary 4. Students who treat these as separate topics struggle when problems mix them.

Bar models with fractions

Bar models now have to represent fractional parts of a whole, which is much harder than partitioning into equal whole-number units. Students who skipped clean bar-model practice in Primary 3 hit a wall here.

If any of these patterns sound familiar, this is likely the right level of support for your child — a trial class is a good next step.

Frequently asked questions

Clear answers for parents

What does Primary 4 Math cover in Singapore?

The MOE Primary 4 Mathematics syllabus covers numbers up to 100,000, multiplication by 2-digit numbers, division by a 1-digit divisor, factors and multiples, mixed numbers and improper fractions, fraction addition and subtraction with related denominators, decimals to 4 decimal places (multiplying and dividing by 10 / 100 / 1,000), area and perimeter of rectangles and squares, line symmetry, line graphs, and average. Bar models extend to representing fractional parts of a whole.

Is Primary 4 the right time to consider tuition for PSLE preparation?

Yes — Primary 4 is the most strategic year of the lower-primary phase. Primary 5 introduces ratio, percentage, and rate, which assume fluent fractions, decimals, and bar-model thinking. Closing gaps in Primary 4 is far cheaper than closing them in Primary 5 alongside new content. Many parents who start tuition in Primary 5 wish they had started in Primary 4.

How does Subject-Based Banding (SBB) affect Primary 4 students?

Most Singapore primary schools use Primary 4 year-end results as the main input into the Standard or Foundation Mathematics placement for Primary 5. The conversation usually happens at the parent-teacher meeting after the SA2 results. A child whose Primary 4 Math grades sit on the boundary benefits most from a strong final term — this is often when targeted support pays the largest dividend.

What is the difference between Foundation Math and Standard Math?

Standard Mathematics is the regular MOE syllabus that most students take through Primary 5, Primary 6, and into PSLE. Foundation Mathematics is a smaller syllabus designed for students who would otherwise struggle with Standard, allowing them to build core competencies at a more manageable pace. DeepThink classes follow the Standard Mathematics syllabus.

My child finds decimals and fractions hard — is that common?

Very common. Primary 4 is the first year decimals and fractions are taught as related ideas (½ = 0.5 = 50%) and used together in word problems. Students who learned each topic separately struggle when problems mix them. The fix is integrated practice that deliberately bridges the three forms, not more drilling on each in isolation.

How do schools decide between Standard and Foundation Math at the end of Primary 4?

Schools weigh Primary 4 Math performance (especially SA2), classroom progress through the year, and teacher recommendation. The decision is shared with parents but the final say on Standard vs Foundation usually rests with the school. Parents can discuss the recommendation if they disagree, but the school is signalling what it believes will best support the child through PSLE.

Can families start with a trial class first?

Yes. Families can book a free trial Primary 4 Math class to see the teaching pace, the structure of the live session, and how the targeted practice between lessons works — before deciding whether to enrol for weekly classes.

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