Differentiation is a big thing in fact major chapter for all Secondary 4 ‘O’ level students.

Read all about the basics Differentiation techniques here. (Examples included) I would like to share one question from my A-Math Ultimate Leap Programme (weekly coaching class) which has 2 different approaches to solve it.

Example:

Very often, I notice students will jump into Quotient rule whenever a fraction is given. Just like this student here:

May I suggest that you pause for 3 seconds to think about the approach. Ask yourself ‘Is there anything I can simplify?’

Here’s another student who pauses:

Notice this student spends his time simplifying before applying chain rule in differentiation.

I hope you enjoy this example. Both students are correct in their answers, which one do you prefer more? A or B?

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One of the interesting questions I discuss with my students every year before major examinations is

‘What foods would you recommend for brain?’

Photo Credit: Bob.Fornal

Generally, I have heard about ‘berries’ and fish help in memory.

It wasn’t until recently that I came across an interesting article on Pickthebrain.com

Here’s a summary of the foods recommended in the article:

1. Herb: Rosemary
2. Tea (Yes! The beverage)
3. Fruits & Vegetables; colors for boosting memory are dark red, blue and green.
4. Fish & Nuts
5. Dessert: Honey

More details here: ‘5 Foods To Remember For Better Memory‘.

So are there any specific foods you take to better your memory? I would love to hear from you! Leave me a comment.

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Photo Credit:purpleslog

In today post,I’m going to talk about some concepts related to everyday life, we call this everyday Math. As you see the image on the side, you know I’m going to talk about money and where is money being ’stored’? Well, safely in the bank! So have you wondered why banks give you interest (peanuts though) for doing you a service of keeping your money safely? Should they charge you?

Today we are going to discuss about interest, compound interest in particular. I would strongly suggest you read these 2 posts before attempting the question first.

1. Simple & Compound Interest
2. Formula Usage on Simple & Compound Interest

These 2 posts discuss the basic concepts on the differences between Simple and Compound Interest as well as what you should note when using the formulas.

I came across the following question while doing an exampaper analysis for my student recently and it so coincides with the topics I want to discuss this week.

Example:

Do the question yourself and check your level of understanding. It should take you 2 minutes.

Spot the error!

Common mistake (click here for image). Did you make this mistake too? Do you know where the error is?

Lesson Learnt

The correct working is shown here. (click)

Test out your understanding

If the original question is modified to compounded half-yearly with the principle amount of $75 000 being deposited at the same rate of 1.8% per annum, calculate the total amount at the end of 1 year. What would be your answer? Leave your answer in the comment section.

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In the previous post, I have discussed the standard equation of circle which is derived from distance formula.

The other equation of circle is known as General.

Example

To answer this question easily, you need your completing square technique (Read about the steps here) which many students dislike!

You notice in the step by step solution, the general equation is converted into a standard equation through the following steps:

1. Arrange all x terms and y terms together
2. Start completing square
3. Simplify all constants
4. Set equation into standard equation of circle

General Equation to Standard Equation of Circle

Radius = 5 and Centre of circe = (4, 1)

I hope you have a better understanding on equation of circle.

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One of the first topics that many Secondary 4 E-Math students learnt is a statistics chapter known as Mean and Standard Deviation (SD for short).

The nice thing about this chapter is that the 2 most important formula are both available in the E-Math (subject code: 4016) formula sheet! No memorization required, just understanding of their usage.

In this post, I will illustrate 2 methods to get the answers for mean and SD for ungrouped data (refer to example). The 2 methods are manual and calculator.

Example:

Given 15, 6, 18, 9, 2 and 4, find the mean and standard deviation.

Manual:

Mean and Standard Deviation Manual Working

Calculator, Casio fx-85MS:

1. Mode, 2(SD)
2. Enter the data in this manner, 15, M+ follows by 6, M+…
3. To get mean: Press ‘Shift’, 2, 1,=
4. To get SD: Press ‘Shift’, 2, 2,=

Here are some additional information you can obtain using the calculator:

Mean - SD from Calculator

Answers obtained through both methods are the same. By knowing these 2 methods, you can use either to double check.

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