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PSLE FRP Math: Why cross multiply?

25 Jul

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A subscriber of http://www.ilearnbywatching.com 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
explanation.  
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.

 

Selection of Speed Math Problems for PSLE Preparation

14 Jun

Teacher Persis’ selection of Primary 6 math problems on speed with video solutions. This might challenge you a bit.



Challenging Primary 6 Math Problems on Volume

11 Jun

Teacher Persis’ selection of Primary 6 math problems on volume with video solutions.

Highlights of 2015 June Holiday Programme

23 Apr

SPECIAL MODULES for PSLE Maths

We have a Special Modules program for P6 pupils who wish to sharpen their skills in following topics:

1. Geometry (include Circles, Area & Perimeter and Angles)

2. Speed

3 & 5 Jun (Wed & Fri)

Time: 3.00 pm to 6.30 pm

Fee: $200

This 2-sessions special class is intended for pupils who want to focus their learning on the 2 major topics of Geometry and Speed. Trainer will highlight effective techniques in the solving of these questions.     **3 students for this class to confirm opening

There will also be special modules for:

P5 Fusion Math: (M)athlympics Training     new!*

Wednesday to Friday, 3 to 5 June 2015

Time: 2.30 to 6.00 pm

Fee: $300

Scope: Number Theory, Geometry, Combinatorics (from past year questions of Annual Mathlympics)

Level: Primary 5

We welcome Primary 4 students to join this training too.  Basic algebra approach to be used to train students.

New Slot!  Monday to Wednesday, 8 to 10 June 2015

Time: 2.30 to 6.00 pm

8 JUNE to 26 JUNE (5-Day Program)

For single student signing up 1 full course: 10% EBD by 10 May 2015, 5% by 25 May 2015. Sign up today!

PSLE A* Achievers

This June, P6 pupils will work on mock papers that comprise of both short and long questions. This is a good time for all pupils to go through a comprehensive revision before the preliminary exams.

As usual, trainer’s explanation of difficult concepts in class is key to helping pupils clarify doubts and misconceptions so pupils are strongly encouraged to ask questions in class.

Practice is the other key ingredient for success in PSLE Math. Hence we are going to have an intensive program that has systematic coverage of PSLE math topics, emphasizes on higher order challenging problems and where pupils’ presentation of solutions will be fine-tuned.

Its almost the last stretch, boys and girls…..let’s stay focused and push on!

P4  & P5 FUSION MATH TRAINING FOR NMOS 

The Preliminary Round of the National Mathematical Olympiad of Singapore is on 1st July 2015, Wednesday. Top scorers will be invited to the Special Round on 28th July 2015, Tuesday.

We continue our intensive training to help P4 and P5 pupils in their preparation for the coming NMOS competition. Knowledge, understanding and skills will be built up through active teaching and learning in class.

Working on mock papers will also give pupils more exposure to the topics and questions most relevant to the competition.

P5 Problem Solving Heuristics

Primary 5 is a crucial period of learning for pupils as they head towards their PSLE next year. As essential skills are taught, pupils build up a stronger foundation and their ability and confidence soar.

We see this in pupils who started their P5 year with us, soaring ahead in their P6 year. We are happy for them, especially those who initially came in with low marks and lacked confidence.

As always, trainers will explain strategies in class but pupils’ attentiveness and diligence in practice is still key to their achievements. Time to work hard, boys and girls!

Upper Secondary Maths & Science

Click here for Secondary Maths classes in June

2013 Prelim Qns

22 May

 


 


 

Question from Joelle

9 May

stock-vector-dividers-clothing-stores-in-the-u-s-vector-illustration-128648960A factory manufactured 2620 ‘Small’, ‘Medium’ and ‘Large’ size T-shirts.  The ratio of the number of ‘Medium’ size T-shirts to the number of ‘Small’ size T-shirts was 1 : 3.  After  of the ‘Small’ size T-shirts,  of the ‘Large’ size T-shirts and none of the ‘Medium’ size T-shirts were sold, there were 1645 T-shirts left.  How many ‘Small’ size T-shirts were there at first?

Please click the following link for suggested solution: Question from Joelle 09.05.14

Percentage Questions

7 May

The total price for 3 items A, B, C is $106. Suppose that A cost 20% more than B while B costs 25% less than C. Find the Value of C.

Mr Chong had some stars. He gave 1/8 of his stars to the first student and 20% of the remaining stars to the second student .Then he distributed the remaining stars equally to the remaining 8 students. If the remaining 8 students received 7 stars each, how many students did he have at first?

A computer shop buys speakers from its supplier for $X each, and earns a profit of 50% for each speaker. During a sale, the shop decides to offer 20% discount off the selling price and the discounted price is $24. Find the percentage of profit earned for each speaker sold during the sale.