Recap of topics learnt so far

Dear all,

As we move into the CA week, let us recap of what we have learnt thus far:

Whole Numbers

• We learnt about numbers up to a million.
• A million has six zeros. 1 000 000 (one million)
• Remember to read the number carefully and write the place value above each digit to be more careful and accurate when rounding off.
• in the number 8245, 5 is the ones, 4 is the tens, 2 is the hundreds and 8 is the thousands.
• When we round off, we always look at the number to the right of the digit. 
• When we round off 8245 to the nearest thousand, we circle 8 and underline 2 (the nearest digit to the right of the thousands place)
• 2 --> round it down.
• 8245 is approximately 8000. 
• 0-4 round it down!
• 5-9 round it up!
• Be sure when to use the equal and approximate sign.
• When we find the exact answer, we use the equal sign.
• When we are asked to round off or estimate, use the APPROXIMATE sign. 

Fractions

• The top number is the numerator and the bottom number is the denominator. 
• In the fraction 1/2, 1 is the numerator and 2 is denominator.
• When we add fractions, be sure to always look at the denominator first. 
• We need to change the denominator into the same number using the common multiple rule. 
• Then, we can proceed to add the fractions up.
• When we add fractions, we only add the numerator!!! The denominator is fixed!
• 1/2 + 1/3 = 3/6 + 2/6 = 5/6
• Improper fractions are fractions not simplified into their wholes and parts. Example: 7/3
• When we change 7/3 into mixed numbers, it becomes 2 whole and 1/3.
• If you are asked to simplify the fraction to its simple form, please make sure you find the highest common factor and divide both numerator and denominator. 
• 4/6 = 2/3 (highest common factor of 4 and 6 is 2) Divide the numerator and denominator by 2 each. 
• When we say that 2/9 -> 10, it is to mean that 2 units out of the total of 9 units is 10. so 2 units is 10, 1 unit is 5 and total units of 9 is 5 x 9 = 45.
• When we convert a fraction to a decimal, always convert the denominator to either 10, 100 or 1000.
• 1/2 = 5/10 = 0.5
• 1/8 = 125/1000 = 0.125
• 3/4 = 75/100 = 0.75
• In the decimal 0.125, 1 is in the tenths place, 2 is in the hundredths place and 5 is in the thousandths place.
• If you are asked to round off 0.125 to its nearest 1 decimal place (it refers to the tenths place), so we circle the number 1 and underline the number 2 (the digit nearest to the right). 2 --> round down. So, 0.125 when rounded off to the nearest 1 decimal place is approximately 0.1.
• Tenths (1 decimal place)
• Hundredths (2 decimal place)
• Thousandths (3 decimal place)

Other things to take note of:

• You must revise through your timeline.
• 1 h = 60min
• Know how to write your time in 24 hour format.
• 2400 = 12 am
• 1200 = 12pm
• 1300 = 1pm
• 0500 = 5am
• Know your units of measurement and conversion
• Area of square --> length x length 
• Area, we use square centimetres!!!
• All the lengths of a square is the same!
• If we are given an area of a square, to find the length, we take the square root of the area given. A same number x the same number = the area of a square.
• 2 x 2 = 4
• 3 x 3 = 6
• 5 x 5 = 25
• 6 x 6 = 36
• Perimeter of square --> length x 4
• Area of rectangle --> length x breadth
• Perimeter of rectangle --> 2 lengths + 2 breadths
• 1kg = 1000g
• 0.7kg = 0.7 x 1000 = 7/10 x 1000 = 700g
• 1m = 100cm
• 0.1m = 0.1 x 100 = 1/10 x 100 = 10cm

Go through your get me thinking book! Go through your file and finish up your corrections.

Homework:

• PTS Worksheet 5.

Remember to read carefully and highlight the key words. Look at the units being asked for in the final answer. The key here is to practise each day and go through questions in your textbook and worksheets again. Don't stress yourself out and if you are unsure of the steps of a question, move on first and then come back to revisit the question again at the end. Do not be too reliant on the calculator. You still need your mental calculation and to work out your long division steps too. I have realised many of you tend to be too dependent on your calculator and have forgotten how to do long division. This is especially important for paper 1 booklet A and B. You can do it. Just cut down on your careless mistakes. 

The target here is to ace your paper 1 and then worry more about your paper 2. 

Sincerely,

Mr Nelson Ong