Ruiya Math Blog
Small ideas that make a hard question feel possible.
Short, child-friendly guides for Singapore Primary Math — built for the moments when a diagram, method or instruction feels confusing.
All guides
Start with the idea your child needs today.
New guides will appear here as Blog No. 2, 3, 4 and beyond.
Hard PSLE Maths
Hard PSLE Maths: when two rhythms meet again
Learn to spot the repeat gap instead of extending two long pattern lists.
Primary 5, Primary 6 and PSLE
Read the guide →Hard PSLE Maths
Hard PSLE Maths: trace only the exposed border
A perimeter strategy for diagrams with lines that look important but do not belong to the answer.
Primary 5, Primary 6 and PSLE
Read the guide →Hard PSLE Maths
Hard PSLE Maths: find the invisible exchange rate
Use equal value to replace one quantity with another—without getting lost in unit prices.
Primary 5, Primary 6 and PSLE
Read the guide →Hard PSLE Maths
Hard PSLE Maths: the question with two correct answers
When a price differs by an amount, the answer may sit on either side—not only one.
Primary 5, Primary 6 and PSLE
Read the guide →Hard PSLE Maths
Hard PSLE Maths: when the denominator moved
A fraction strategy for questions where the whole quietly changes halfway through.
Primary 5, Primary 6 and PSLE
Read the guide →Hard PSLE Maths
A hard PSLE Maths problem: the ratio-and-transfer strategy
A five-star PSLE-style challenge that teaches you how to join ratios, track a transfer and spot the traps.
Primary 6 and PSLE
Read the guide →Angles
Not drawn to scale: what angle diagrams really tell you
Learn what to trust in an angle diagram — and why measuring it with your eyes can lead you astray.
Primary 5, Primary 6 and PSLE
Read the guide →