LESSON 26 SYNOPSIS (15 June – 21 June 2026)

15 June 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 26

This lesson develops students’ reasoning in Numbers to 40 L5, focusing on the Before and After concept — a structured framework for solving change problems involving addition and subtraction within 40.

Learn to sequence events in logical order, building the habit of identifying what happens first, next, and last
Apply the Before-After model to identify known and unknown quantities across three states: before, change, and after
Practise working forward to find the “after” value when the starting amount and change are known
Strengthen working backward reasoning to find the “before” value when only the result is given
Reinforce finding the change when both the before and after values are provided
Consolidate column addition and subtraction within 40 as the computational tool supporting each problem type

Primary 2 Lesson 26

This is a revision lesson. Select 7 revisits key P2 topics — the four operations, measurement (length and mass), and comparison problems — consolidating the reasoning skills needed across these interconnected areas.

Reinforce the link between multiplication and repeated addition, and between multiplication and division as inverse operations
Apply before-after reasoning and equal sharing to one-step and two-step word problems
Strengthen comparison thinking using more than / less than structures across length and quantity contexts
Practise identifying unknowns within equations, including missing factors and missing subtrahends
Consolidate multi-step problem solving where two quantities must be found before a total or difference can be determined
Reinforce measurement estimation and unit selection for length (cm/m) and mass (g/kg)

Primary 3 Lesson 26

This is a revision lesson. Select 7 revisits multiplication and division, money, and comparison problem structures, consolidating the multi-step reasoning built across P3.

Reinforce times-as-many relationships, identifying the correct unit and multiplier before computing totals
Apply part-whole thinking to problems where a total is split across two or more quantities in a fixed ratio
Strengthen working backwards from a known end state to find an original quantity
Practise multi-step money problems requiring subtraction of known costs to isolate an unknown item’s value
Consolidate equal units reasoning where grouping reveals the value of one unit within a larger total
Apply before-after comparison thinking to problems where two quantities change and a new relationship is established

Primary 4 Lesson 26

This is a revision lesson. Select 7 revisits money, fractions, angles, and supposition-type reasoning, integrating the key problem-solving structures developed across P4.

Reinforce equal transfer reasoning where a known difference changes after a transfer, requiring students to track what shifts and what stays constant
Apply the supposition method to problems involving two variables and a fixed total — including notes, scores, and mixed-item scenarios
Strengthen simultaneous comparison thinking to isolate the value of one item when two combined costs are given
Practise angle properties of straight lines, rectangles, and squares to find unknown angles within geometric figures
Consolidate multiples and patterns reasoning, including plant-and-post interval problems and age-multiple conditions
Reinforce multi-step computation involving rounding, perimeter, and mass across varied contexts

Primary 5 Lesson 26

This is a revision lesson. Select 8 revisits area, volume, rates, and time, consolidating the geometric reasoning and real-world problem structures central to P5.

Reinforce area of triangles within composite figures, including identifying the correct base-height pair when triangles share sides or overlap
Apply part-whole area reasoning to figures where shaded regions require subtracting known areas from a total
Strengthen volume and water-level reasoning, connecting base area, height change, and capacity across tanks and containers
Practise rate and proportion thinking across time-based scenarios including printing rates and simultaneous filling-and-draining problems
Consolidate stepped-rate interpretation from tables, requiring students to identify the correct tier and compute charges accurately
Reinforce spatial reasoning with unit cubes — identifying surface faces and working backwards to find the smallest possible cube

Primary 6 Lesson 26

This lesson builds foundation in Area of Triangles, focusing on the geometric reasoning required to analyse area relationships within composite figures — a high-frequency PSLE topic.

Learn the principle that ratio of bases equals ratio of areas when triangles share the same height, and vice versa for shared bases
Apply ratio reasoning to identify the value of one triangular region when a total or partial area is given
Strengthen the concept that triangles with equal bases and heights are equal in area, regardless of where the apex sits
Practise finding shaded regions by decomposing composite figures into triangles and rectangles, then applying part-whole area thinking
Consolidate the relationship that a triangle is half the area of its enclosing rectangle, used to find unknown regions efficiently
Reinforce expressing areas as fractions or ratios of a whole figure across multi-region problems