LESSON 18 SYNOPSIS (20 April – 26 April 2026)

19 April 2026

At Matrix Math, we provide an engaging and detailed learning experience for your child. Matrix Math Tuition programme focuses on essential concepts that will further strengthen their mathematical foundation. The lesson synopsis gives parents a clear preview of the topics and problem-solving skills that will be covered in class. At Matrix Math, we ensure that each lesson is designed to build confidence and mastery in math, preparing students for success in both school and beyond.

Primary 1 Lesson 18

This lesson builds foundation in Numbers to 20 L6, using the Before–Change–After model to solve word problems within 20. Students identify which element — the before state, the change, or the after state — is unknown.

Learn to represent addition and subtraction word problems using the Before–Change–After model
Apply working forward reasoning to find an unknown After when Before and Change are given
Practise handling two simultaneous changes within a single problem structure
Strengthen finding the change by working between a known Before and After state
Introduce working backwards to determine an unknown Before by reversing the given operation

Students build the reasoning habit of classifying unknowns, preparing them for multi-step word problems.

Primary 2 Lesson 18

This lesson builds foundation in Time 1, covering analogue clock reading, duration arithmetic, and working-forward time problems. Students handle both unit conversion and real-life scheduling contexts.

Learn to read analogue clocks by identifying hour and minute hands precisely
Reinforce a.m. and p.m. distinctions and varied expressions of time
Apply adding and subtracting durations in hours and minutes, with regrouping when needed
Practise converting between total minutes and hours-and-minutes using the 60-minute relationship
Strengthen working forward to find an ending time by adding a known duration to a start time
Introduce unit rate thinking to compute total duration before locating the ending time

Students build readiness for multi-step time problems involving sequential events and duration tracking.

Primary 3 Lesson 18

This lesson integrates Graphs with the Supposition Method, covering data interpretation and logical exchange reasoning. Students work with bar and picture graphs while also solving two-group problems by systematic assumption and adjustment.

Learn to extract difference, total, and multiple relationships from bar and picture graphs
Apply “times as many” reasoning to link multiplication directly to graph data
Practise equalization thinking — determining how many units must be transferred between two groups
Introduce the Supposition Method: assume all items are one type, then exchange systematically to match the given total
Reinforce exchange reasoning to calculate the number of swaps needed to close the discrepancy

Students build fluency in data interpretation and logical reasoning.

Primary 4 Lesson 18

This is a revision lesson under Select 3, consolidating fractions, factors and multiples, line graphs, and before-after problem structures. Students revisit these topics together to sharpen model selection.

Consolidate fraction-as-units and fraction-as-values reasoning to find totals, remainders, and distributed amounts
Reinforce common multiples thinking to solve grouping and scheduling word problems
Strengthen line graph interpretation — reading trends, computing differences, and identifying peak values
Practise the before-after bar model with external transfer, where both quantities change equally and the difference is preserved
Apply unchanged difference, given units, and given total strategies to two-entity comparison problems

Students build the flexibility to identify the correct model across mixed problem types.

Primary 5 Lesson 18

Under Decimals & Fractions 5, students develop fluency in decimal operations with powers of ten, measurement conversion, and proportion-based bar model reasoning. Problems span pure computation through to structured multi-step word problems.

Learn to multiply and divide decimals by tens, hundreds, and thousands by decomposing the multiplier
Apply decimal operations to convert measurements across units — m, km, kg, g, L, and ml
Practise splitting compound measurements into whole and decimal parts
Strengthen external transfer bar model reasoning where both quantities change and the unknown is found through equal units
Introduce proportion external transfer — using a known difference before transfer to find the original quantity

Students build precision for multi-step problem sums.

Primary 6 Lesson 18

This is a revision lesson under Select 1, covering patterns, algebra, area, volume, ratio, percentage, and rate. Students practise flexible model switching across a broad mix of P6 problem types.

Consolidate number patterns — finding the nth term and reverse-working to identify a figure number from a given total
Reinforce algebraic reasoning, including expressions with variables, substitution, and simultaneous-condition problems
Strengthen composite area problem solving involving overlapping shapes, circles, and ratio-based shading
Practise volume and rate — calculating capacity, flow rate, and unit conversions
Apply ratio and percentage to find shaded and unshaded parts within geometric figures

Students sharpen the ability to select the correct method across mixed problem types, essential for the PSLE examination.