Archive | July, 2016

PSLE FRP Math: Why cross multiply?

25 Jul


A subscriber of asked:

Hi! My daughter has been watching some of the FRP videos and the most recent 
one she is looking at is the P6 Set B Rev Up. 
She realised that "cross multiplication" occurred many times. 
She does not understand why she must cross multiply. 
Is that a special method? 
How does it work? I would be grateful if you could help us. 
Thank you very much! 
Warm regards Kelly :)

Our reply:

–This part of the working for our students will be the mechanical part of the working after the set up. A quick way to understand is: 1u + 10 / 5u – 30  = 1/3

So essentially you are cross multiplying the above.

–You could understand it through equality …meaning: 2/3 = 4/6, cross multiply you get 6X2 = 3X4 . So cross multiplication holds true.

If you are drawing bar models, you could explain it with parts and units. So 3 of (1u + 10) equals 1 of (5u – 30). You can draw the 1u as a rectangular block.

Thank you so much!! My daughter understands the bar model
She says she now knows how to use the cross multiplication method. 
Thank you and the teacher very much for helping her.

Warm regards & with gratitude
Kelly :)

We are happy to reply to our subscribers.


JC H2 Maths Topic Outline

19 Jul


Contact us at for help in your JC Math. Mentoring for JC Physics also available.

Topic Level
Pure Mathematics
Graphing JC1
Functions JC1
Equations & Inequalities JC1
Sequences & Series: Arithmetic (AP) and Geometric (GP) JC1
Sequences & Series: General, Sigma Notation, Method of Differences JC1
Mathematical Induction JC1
Differentiation Techniques JC1
Differentiation Applications JC1
Integration Techniques JC1
Integration Applications JC1
Power Series (Maclaurin) JC1
Differential Equations JC1
Vectors (1) – Basic Concepts, Dot Product & Cross Product JC2
Vectors (2) – Lines JC2
Vectors (3) – Planes JC2
Complex Numbers JC2
Permutations and Combinations JC2
Probability JC2
Discrete Random Variables JC2
Binomial Distribution JC2
Normal Distribution JC2
Sampling Theory JC2
Hypothesis Testing JC2
Correlation & Regression JC2

☺ This is only a typical sequence of topics. Different schools teach them in different orders. Please inform us of your school’s Scheme of Work for Mathematics, if/when available. Our tutor will customise the lessons according your schools’ current and impending topics. If you require revision of previous topics, please inform us also, and we will think of a way to help you.

☺ Our worksheets are carefully designed, based on the latest syllabus and trends of the types of questions, and based on more than 20 years’ experience in diagnosing students’ common difficulties and misconceptions. During lessons, we provide special tips / techniques and problem-solving guidance.

Please inform us of impending school tests and exams. We provide revision sheets, mock tests and mock exams to prepare students to maximise their readiness to tackle the rigour of school summative assessments.


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H2 Math Tips

H2 Math Tip : Common difficulty for inverse functions

H2 Math Tip : Composite Finctions — Common difficulty

Mole Concept and Stoichiometry Workshop

4 Jul


Mole Concept and Stoichiometry is one of the harder topics for GCE ‘O’ Levels / IB / IP Chemistry students to grasp when it is not quickly mastered at the start. The concept combines Mathematical Calculations with Chemistry theory and once that becomes clearer, it should not become a stumbling block anymore.

Workshop Dates:

Basic Mole Concept and Stoichiometry:    4 July (Mon) & 8 July (Fri) Time: 6 to 9pm

Advanced Mole Concept and Stoichiometry: 18 July (Mon) & 22 July (Fri) Time: 6 to 9pm

Basic Concepts in Acids, Bases & Salts (theory+exercises): 25 July (Mon) & 29 July (Fri) Time: 6 to 9pm

Advance Concepts in Acids, Bases & Salts (exercises): 30 July (Sat) 9.30am to 12.30pm & 1 August (Mon) 6 to 9pm

Fee: $140 per workshop

To sign up, email to or whatsapp to 8121 6628.

H2 Math Notes: Here is a Tip on Simplifying a Summation

3 Jul

Shifting Technique