1. Mrs. Walker 4 th grade math

2. Factors are numbers that are multiplied 8 X 8 = 64

3. …find all the numbers you can multiply together to get that number as the product. What does “Find the factors” mean?

4. EVERY number greater than 1 has the number 1 and itself as a factor.

5. 27: 1 X 27 3 X 9 27: 1, 3, 9, 27 HINT: Always write factors from least to greatest. Remember, you are being asked to find all the numbers that can be multiplied together to get the answer 27.

6. Find the factors: 1. 18 2. 24 3. 21 4. 52

7. What does COMMON mean? What does FACTORS mean? So….. COMMON FACTORS are: Factors that two or more numbers have in common

8. 16 1 X 16 2 X 8 4 X 4 24 1 X 24 2 X 12 3 X 8 4 X 6 Hint: Once you repeat a number you’re done!! 16: 1, 2, 4, 8, 1624: 1, 2, 3, 4, 6, 8, 12, 24 Common Factors: 1, 2, 4, 8

9. What are the common factors of: 1. 6 & 9 2. 24 & 48 3. 25 & 45

10. The greatest factor that both numbers have in common. GCF = Greatest Common Factor

11. 9 1 x 9 3 x 3 9 : 1,3,9 12 1 x 12 2 x 6 3 x 4 12: 1,2,3,4,6,12

12. Find the GCF: 1. 12 & 26 2. 9 & 21

13. List the factors: 1. 36 2. 18 3. 27 List the common factors: 1. 18, 22 2. 52, 36 3. 14, 9 List the GCF: 1. 25, 40 2. 30, 42

14. Math Book Pg. 112 #s 11-18 And Pg. 113 #s 36-43

15. Multiples form a skip counting pattern! 5: 5, 10, 15, 20, 25, 30… Example: 15 is a multiple of 5 because it is made up of 3 groups of 5.

16. Use the inverse operation of multiplication, Division To find multiples!

17. 7: 7, 14, 21, 28, 35, 42

18. Strategy: Use a division number sentence. 108 ÷ 6= (if the quotient is a whole number then 6 is a multiple.) Solution: Yes, 108 is a multiple of 6 because 108 ÷ 6= 18

19. Find 10 multiples of: 1. 3 2. 8 3. 11

20. A multiple that 2 or more numbers have in common.

21. What strategy would you use? That’s Right! Division 36 ÷ 6= ? 36 ÷ 9=? Yes, 36 is a common multiple of 6 and 9.

22. 1. Is 42 a common multiple of 6 and 9? List 10 multiples of each number and circle the common multiples. 2. 3,6 3. 4, 12 4. 2, 5

23. The lowest multiple that both numbers have in common. LCM EX. What is the LCM of 12 and 24? Strategy : List the multiples of 12 and 24. 12:12,24 24: 24

24. List the first 5 multiples of each number. 1. 2 2. 4 3. Name the LCM of the following numbers: 20 and 5 4. How many common multiples less than 50 do 8 and 9 have? Name them

25. MB pg. 112 #s 19-26 And MB pg. 113 #s 44-52