Respuesta :

kaa0105
First you want to multiply 72 and 20.

You will get 1440

 2 hundreds (100) = 200       (2* 100)

1440- 200= 1240

4 tens (10) = 40                   (4*10)

1240+40= 1280

1280 is your answer. 

Hope this helps! :)