Get me Thinking 1

Dear all,

As we come to the end of week 3, we are now almost halfway through our second topic, Whole Numbers 2. Important points for Friday would be:

• When asked to estimate 3479 x 32, we look at the numbers and find out what is the greatest place value for the numbers respectively. 
• 3479 is up to thousands, therefore we round the number to the nearest thousand.
• 32 is up to tens so we round the numbers to the nearest tens.
• 3479 is approximately 3000 and 32 is approximately 30.
• 3000 x 30 = 3000 x 3 x 10 = 9000 x 10 = 90000

We also went through 4 questions of our enrichment book. We learnt about the skill of using 'Guess and Check' to solve word problems. On Friday, we looked at the importance of model drawing. Model drawing is especially useful when we need to compare items and drawing the models will be able to help you visualize better. Key important points would be for you to draw neatly using a ruler and label the models. 

Next week will be a short week and there will be NO enrichment lessons, therefore, remember to finish questions 3 - 6 of the enrichment worksheet for Whole Numbers so that we can go through during lesson on the following Friday.

Sincerely,

Mr Nelson Ong

Word Problems

Dear all,

Today, we focused on the use of the heuristic skill of 'Guess and Check' to solve word problems. Before you attempt the word problems, you first need to understand the problem through highlighting of key words and jotting down notes/pointers. Be accurate in what you are trying to find. Take note of the units of measurement.

Then, we work out a heuristic (skill) to solve the word problem. Should we use the model method? Should we use the making assumptions method? Do we use Guess and Check? In today's lesson, we focused on using 'Guess and Check' when there are a series of unknown variables.

You need to be precise with your guess and check table and always have a last column to indicate 'Check'.

Establish a pattern for your guesses in order to help you to make correct guesses and eventually to solve the question.

Homework:
PTS Worksheet 2

Also, I listed some important points of solving word problems today.

the units of measurement for minutes is min, NOT m.
m represents metres.

Take note of the importance of the symbol = and -->
= equals to
--> represents

We cannot say that 10 min = 20ml because this is not logical. 10 min is 10 minutes and how can 10 minutes be equal to 20ml. We use the arrow sign to say that 10 min --> 20ml because 10 minutes represents the amount of water being lost and in this cause, it is 20ml. Do take note of this.

Always check for your NUMBER STATEMENT (Units of measurement must be present!), WORD STATEMENT and answer in the answer line if there is one.

Strive to be accurate and careful.

Sincerely,
Mr Nelson Ong

Whole Numbers 2

Dear all,

We embark on our new topic yesterday and continued with multiplying of whole numbers by 10s, 100s and 1000s.

Today's concepts are:

• When we multiply a whole number (without any decimals) by 10, we can add a 0 to the back of the number. 12 x 10 = 120
• When we multiply a whole number (without any decimals) by 100, we can add two 0s to the back of the number. 12 = 100 = 1200
• When we multiply a whole number (without any decimals) by 1000, we can add three 0s to the back of the number. 12 x 1000 = 12000
• When we multiply a whole number by groups of tens (e.g 30, 40, 50, 60), we can break the groups of tens up first. 12 x 80 = 12 x 8 x 10 (8 x 10 gives you 80). This breaks the numbers down into smaller and simpler digits for multiplication rather than taking big numbers and multiplying them straightaway. As a result, you will take 12 x 8 which gives you 96 and then multiply 96 by 10 which will give you 960.

Homework:

• Pages 25 - 27 of the workbook

Sincerely,

Mr Nelson Ong

Using calculators and Recapping Whole Numbers

Dear all,

Do bring your money for the enrichment books ($19.20 for both books).

Today, we started on Whole Numbers 2, using the calculators to calculate whole numbers (using the mathematical symbols of plus, minus, divide and multiply).

I also went through the feedback for your Challenging Practice and Word Problems for your Whole Numbers 1. I will finish marking the corrections, giving you feedback and then giving them back for your parents to sign and acknowledge.

Homework:

Pages 23 - 24 of the activity book

Sincerely,
Mr Nelson Ong

Completion of Whole Numbers (1)

Dear all,

It is the end of week 2. We have completed the topic of Whole Numbers (1). In a nutshell, the important points of the topic would be:

• Knowing that a million has six zeroes. 
• Learning how to write numerals in words 
• Counting place values of numbers up to a million
• Learning how to round off numbers to nearest place values. (Number line method or the underline and circle method as recapped in the last post)
• Estimating whole numbers to the nearest place values and using the approximate sign
• Applying whole numbers to solving challenging problems and word problems

Through this first topic, I can see that some of you have applied what I have taught you, especially in highlighting key words, making notes and writing the steps down. However, one big point which can be improved further is reading carefully. Many careless mistakes are apparent in your work. This is effort on your own part. I won't be able to sit beside and tell you "Have you checked?" "Have you read carefully while u highlight also?" You need to be able to have the habit of checking back and not losing unnecessary marks. 

Homework:

• Finish up the remaining pages of the workbook. :)

 As in the lesson on Friday, I will go through the challenging practice and word problems with you without passing you your questions as of yet. I want everyone to internalise and understand what I have taught. Therefore, you need to really pay attention in class especially when I talk about concepts, formulas and key skills for you. Then after that, I will erase what I have gone through and have you apply yourselves. Instead of just feeding you the answers, I want to challenge you to understand, think ahead and apply what you have learnt.

On Friday, I reinforce with you that if a number is even, its digit in the ones place is always an even number like 0, 2, 4, 6 and 8. If a number is odd, its digit in the ones place is always an odd number like 1, 3, 5, 7 and 9. Always look out for the ones place's digit to determine if the entire number is odd or even.

Have a good weekend.
PS: I will collect the money from you guys for the books on Monday. Rest assure that I will be using the books and we will not let it go to waste. This is the promise I will keep! Enrichment lessons commence next Friday.

Sincerely,
Mr Nelson Ong

Rounding off and Estimation

Dear all,

Today's lesson concentrated on the teaching of rounding off of numbers up to a million and the use of the estimation mathematical symbol. Just to recap with you:

• There are two ways we can use to round off whole numbers to their nearest place value.
• In the first method, we circle the place value we want to round off to and underline the digit of the place value to the right of it. Then, we make use of this concept '5 - 9 round it up' and '0 to 4 round it down'.
• In the number 108923, if I want to round this number to the nearest thousand, I would circle the number 8 (in the thousands place) and underline the number 9 (the next place value to the right of the place value of thousands). Since 9 is rounding up, the '8' would have to round up to '9' and as such, the answer of 108923 when rounded off to the nearest thousands would be 109000. 
• So, we say that 108923 is approximately 109000. 

• In the other method, we can use the number line method. 
• 108000 ----------------|-------------------|----109000
•                                                       108500                108923
• Since 108923 is towards the right, we then round it up to 109000. 

So far, based on my markings, the topic of whole number has been fairly simple on the whole. Most of you are able to get the concepts and skills right. However, the biggest problem lies in your accuracy. Many of you are still careless and you do not read carefully. You tend to assume, especially when it comes to number patterns questions. Thus, do read carefully and always check back! 

Homework:

• Pages 15 - 18 (Leave out Qn 7 on page 18)

Note:

• As part of Enrichment, we will be using the assessment book as seen below. My promise to all of you is that we will doing as much as we can for the workbook. There are chapters in which I will have to complete all the questions with you. As part of enrichment as as the word goes, it is to challenge you greater and get you thinking. Also, to have higher order thinking and exposure to difficult questions would help you to improve your mathematics. We will look at ways to solve problem sums and to tackle them successfully. There will be Part A (Semester 1) and Part B (Semester 2) and both books will cost $19.20. Do let me know if there are any objections to getting the books. Hope everyone will be able to get them. 

Sincerely,

Mr Nelson Ong

Comparing Numbers up to a Million

Dear all,

We started on the topic of comparing numbers up to a million. Recapping some important concepts for today's lesson:

• When comparing numbers, always start from the left. 
• Compare the numbers to find out which is greater or smaller. 
• Highlight the two comparing digits on the left of each number.
• 1458
• 1548
• The first digit on the left is the same so we move on to the next digit (place value) and since 5 is greater than 4, 1548 is the greater number. 

Some of the common mistakes as highlighted in the last worksheet:

• When we are looking for 'the value of' and finding what a number 'stands for', it is essentially the same meaning. We are finding out the numeral. Do take note. They stand for the same meaning.
• 40 in words is forty and not written as 'four tens'. Take note too.

Homework for today:

Pages 11 - 14 of the workbook.

Practice makes perfect.

Sincerely,

Mr Nelson Ong