Kungfu math p4 slide4 (factors)pdf
Upcoming SlideShare
Loading in...5
×

Like this? Share it with your network

Share
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
391
On Slideshare
376
From Embeds
15
Number of Embeds
2

Actions

Shares
Downloads
2
Comments
0
Likes
0

Embeds 15

http://localhost 9
http://www.kungfumath.sg 6

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. Whole Numbers Factors What will we learn today? • determining if a 1-digit number is a factor of a given number, • listing all factors of a given number up to 100, • finding the common factors of two given numbers
  • 2. What are factors?A factor is a smaller number thatdivides exactly any larger number andgives the remainder zero.For example,6 is not "exactly divisible" by 4 and 5.So, 4 and 5 are not factors of 6.
  • 3. How to find factors of a number? We will find all the factors of 12 by finding all the numbers that 12 can be exactly divided by. 12 ÷ 1 = 12 12 ÷ 2 = 6 12 ÷ 3 = 4 12 ÷ 4 = 3 12 ÷ 6 = 2 12 ÷ 12 = 1 12 is exactly divisible by 1, 2, 3, 4, 6 and 12.So 1, 2, 3, 4, 6 and 12 are the factors of 12.
  • 4. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 9 1 3 15 1 15
  • 5. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 1x7=7 9 1 3 15 1 15
  • 6. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 1x7=7 9 1 3 9 1x9=9,3x3=9 15 1 15
  • 7. Write all the factors for the numbers below(the first one is done for you): 4 1 2 4 7 1 7 1x7=7 9 1 3 9 1x9=9,3x3=9 15 1 3 5 15 1 x 15 = 15 3 x 5 = 15
  • 8. What are the factors of 20?
  • 9. What are the factors of 20? 1 x 20 = 20 2 x 10 = 20 4 x 5 = 20 Step 1:Write down the multiplication sentences of 20.
  • 10. What are the factors of 20? 1 x 20 = 20 2 x 10 = 20 4 x 5 = 20Step 2: Do not write the factors twice. 4 x 5 = 5 x 4. You only need to write down 4 and 5 once.
  • 11. What are the factors of 20? 1 x 20 = 20 2 x 10 = 20 4 x 5 = 2020 is exactly divisible by 1, 2, 4, 5, 10 and 20.So 1, 2, 4, 5, 10 and 20 are the factors of 20.
  • 12. What are the common factors of 40 and 72?
  • 13. What are the common factors of 40 and 72?1 x 40 = 40 1 x 72 = 722 x 20 = 40 2 x 36 = 724 x 10 = 40 3 x 24 = 72 4 x 18 = 725 x 8 = 40 6 x 12 = 72 8 x 9 = 72 Step 1: List down all the factors.
  • 14. What are the common factors of 40 and 72?1 x 40 = 40 1 x 72 = 722 x 20 = 40 2 x 36 = 724 x 10 = 40 3 x 24 = 72 4 x 18 = 725 x 8 = 40 6 x 12 = 72 8 x 9 = 72 Step 2: Circle the common number you see.
  • 15. What are the common factors of 40 and 72?1 x 40 = 40 1 x 72 = 722 x 20 = 40 2 x 36 = 724 x 10 = 40 3 x 24 = 72 4 x 18 = 725 x 8 = 40 6 x 12 = 72 8 x 9 = 72 The common factors are 1, 2, 4 and 8.
  • 16. Are you ready to try out the questions?