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LOWEST COMMON MULTIPLE OR LCM We start today’s class with a video. It is important that you watch the video very carefully and understand what is being taught. You may choose to play the video again to get a better understanding. https://www.youtube.com/watch?v=qMZBJWng9N8 In this video you have seen how one can determine the  LOWEST  COMMON  MULTIPLE.  I hope you have understood what is LCM. However, writing down the common multiples and then choosing the lowest common multiple by this method for two or more numbers is a slightly long method. Instead we could choose to find out the LCM by the division method.  For this, it is important that you must know your tables and short division. Remember, I told you this right in the beginning.  WATCH THIS VIDEO https://www.youtube.com/watch?v=o7i2BZC9_UA                                     ...

Good morning boys  Today we are going to revise what we have studied in HFC and LCM. Answer the following: Q1. The LCM of 2 numbers is 180. Then which of the following is not the HCF of the numbers. a. 45          b. 60          c. 75            d. 90 Q2. Find the HCF of the following by the long division method 75, 120, 240 Q3 Find the LCM using the prime factorization method. 75, 150, 200? Q4. The HFC of 27 and 63 is ______? a. 3           b. 6           c. 9             d. 18 Q5 The smallest common factor of 4, 12, 16 is ______? a. 1          b. 2           c. 4              d. 8 Q6. The LCM of 12 and 48 is ________? a. 6          b. 12         c. 24...

GOOD MORNING AND WELCOME BACK                                                Today we will learn to find the Highest Common Factor by  the  Continuous Division Method.  In this method   you could find the HCF using fewer steps. This method is faster. It only requires a bit of practice, however. Have a look at this video. https://www.youtube.com/watch?v=fAXlbjY1T_Q Did you notice that in the division method, we can find the HCF in just a couple of steps? When we have larger numbers this method is extremely useful.                                      HCF of 180 and 75 is 15.                                         ...

…………… WE CONTINUE WITH PRIME FACTORISATION I HOPE YOU ENJOYED MAKING THE FACTOR TREES AND HAVE UNDERSTOOD EVERYTHING. It is really important that you become extremely good at prime factorisation. For this you need to check: Do you know the following? ·        What is a prime number? ·        What is a composite number? ·        What are coprime numbers? ·        Write down the number as a product of its prime numbers. In the previous post you have learnt prime factorization using the factor tree. Have a look at this video. In this video we will see how to determine the prime factors of a given number  using the division method. https://www.youtube.com/watch?v=uwUqzeHth6s You will need to make yourself an expert in short division. For that I hope you know your tables from 1 to 15 at least.  FIND OUT THE PRIME FACTORS OF THE GIV...

April 16, 2020 Good Morning boys  Today you are going to revise what you have studied so far.   REVISION WORKSHEET - FACTORS AND MULTIPLES, DIVISIBILITY Q1. which of the following is not a factor of 18? a. 2         b. 3          c. 6           d. 8 Q2. The prime number which is even is _______? a. 2         b. 3          c. 5           d. 13  Q3. The greatest prime number between 1 and 10 is ______? a. 7         b. 5          c. 3           d. 2 Q4. 128 is divisible by ____ a. 2        b. 3           c. 5             d. 10 Q5. 1331 is divisible by _____ a. 11      b. 2        ...

WE ARE GOING TO HAVE SOME FUN TODAY                                                                                                                                                                                                                                                                   So what you see here are the numbers...

Good morning boys, this is your 8th lesson. The topic for today is other rules of divisibility. 1. if a number is divisible by another number, then it is divisible by each of the other factors of that number. Eg. 9 is a factor of 18.        3 is a factor of 9. Therefore 3 and 9 are both factors of 18. Take 2 is a factor of 6 and it also divides 18, therefore 2,3,6,9 are factors of 18. 2. if a number is divisible by 2 co prime numbers then it is divisible by its product. Eg. 80 is divisible by 5 and 4. So, its is divisible by 5 X 4= 20 also, 80 is divisible by 5X2 =10 also  3. If 2 given numbers are divisible by a number then their sum is also divisible by the number. Eg. 16 and 20 are divisible by 4 So, 16+20=36 is also divisible by 4 16 and 20 are divisible by 2. 16+20=36, is also divisible by 2. 4.If 2 given numbers are divisible by a number then their difference is also divisible by that number. Eg. 35 and 20 are divisible by 5.   ...