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.

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**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

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**

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

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

]]>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.

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Please click the following link for suggested solution: Question from Nicholas 05.05.14

]]>Mrs Ho bought some cakes for the children in an orphanage. The girls received twice as many cakes as the boys. There were as many boys as girls in the orphanage. Each boy ate 4/9 of a cake and they finished all the cakes given to them. Each girl ate 3/4 of a cake and they had 3 3/4 cakes left. How many cakes did Mrs Ho buy for the children?

Please click the following link for suggested solution: Question from Renee 04.05.14

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2. An open-air concert ticket for an adult was priced at $85.50. There were 150 more male adults than female adults for the first night concert. For the second night concert, the number of female adults was decreased by 15% and the number of male adults was increased by 30%. If there were 1270 adults in the second night concert, how much more money was collected from the sale of the tickets for the second night concert than the first night concert?

Please click the following link for suggested solution: Questions from Joelle 04.05.14