Math - Mrs. Dobson

This will be our math page for the year!

Here is the link to the math textbook pages

Factors and Multiples

Just as we can use numbers to describe things we can also use them to describe other numbers.

1. Factors : A factor is a number that divides into another number.For example, 1 , 2 , 4 and 8 are all factors of 8 as each goes into 8 without leaving a remainder.

2. Prime numbers : A prime number only has 2 factors , 1 and itself. 2 , 3 and 5 are examples

3. Composite numbers: A composite number has more than 2 factors. Examples are 6 , 9 and 10

4. Common factors : When looking at 2 or more numbers ,if any factors are the same they are called common factors. For example let's examine the factors of 18 and 24.

18 : 1 , 2 , 3 , 6 , 9 , 18

24 : 1 , 2 , 3 , 4 , 6 , 8 , 12 , 24

The common factors are 1 , 2, 3 ,6 . 6 would be the Greatest Common Factor or GCF

5. Multiples : When you multiply a number you will be finding a multiple of the number . For e.g for 6 its multiples would be 6 , 12 , 18 ... And so on.

6.Common multiples : When two numbers have the same multiple it is a common multiple , For e.g 12 is a common multiple for 3 , 4 and 6.Now these three numbers have all of the numbers in the 12 times table as multiples but the smallest out of them is 12 therefore called The Least Common Multiple or the LCM

Here are the 2 slides!

4. Prime Factorization LESSON.ppt
4.6. FACTORS and MULTIPLES

Math Problem Of The Month

In a bag of small balls 1/4 are green, 1/8 are blue, 1/12 are yellow and the remaining 26 white. How many balls are blue?