1 / 5

X by 20

Can you remember how to x by 20? Lets try 25 x 20. First split 20 into two of it’s factors: 2 and 10 Multiply 25 x 2 = 50 Now multiply 50 x 10 That gives us 500. X by 20. 36 x 20. 36 x 2 =72 72 x10 =720. Shall we try it again. Easy!!! Let’s split 4 into 2x2 Then we’ll x 10.

ganya
Télécharger la présentation

X by 20

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Can you remember how to x by 20? Lets try 25 x 20 First split 20 into two of it’s factors: 2 and 10 Multiply 25 x 2 = 50 Now multiply 50 x 10 That gives us 500 X by 20

  2. 36 x 20 36 x 2 =72 72 x10 =720 Shall we try it again

  3. Easy!!! Let’s split 4 into 2x2 Then we’ll x 10 So 17 x 40 17x2 =34 34x2=68 68x10 =680 Now try 23x 40 on your own. Now what about x 40

  4. Easy!!!!! Just x by 20 Then adjust, take one away. Eh-I don’t understand (Louise!!) Well lets do 15 x192 So 15 x 20 so 15 x2 =30 x10 =300 Then take away one lot of 15 300-15=285 How can we x by 19?

  5. 18 x 19 22 x19 33x19 35 x19 26 x 19 42 x19 47 x19 55 x19 Think you are clever-work out a quick way of x 21. E.g 18 x 21 18 x20 =360 Then add another lot of 18 =378 Now try these

More Related