color(blue)("This is how the process should look and it is very quick:")
color(white)(..)cancel(9)^8 .cancel(4)^14
color(white)(..)ul(7color(white)(..).9)
color(white)(..)1color(white)(..).5
color(white)(..)
color(white)(..)
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
color(blue)("This is the very detailed explanation")
Write as:
" "9.4
" "ul(7.9) larr" Subtract"
Work from right to left
'~~~~~~~~~~~~~~~~~~~~~~~~~~~
color(green)("Subtracting the right column")
Notice that the right hand column the 4 is less than the 9.
For subtracting this part we have color(red)(9+4/10)color(blue)( -9/10)
This is the same as color(red)(8+14/10)color(blue)(-9/10)
So in our subtraction of the right column, instead of having:
color(white)(.)9color(magenta)(.4)
ul(color(white)(..) color(magenta)(.9)) larr" Subtract"
We have:
color(white)(.)8color(magenta)( .cancel(4)^14)
ul(color(white)(....) color(magenta)(.9)) larr" Subtract"
color(white)(....)color(magenta)(.5)
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
color(green)("Subtracting the left column")
color(white)(..)color(magenta)(8) .cancel(4)^14
ul(color(white)(..)color(magenta)(7) .9) larr" Subtract"
color(white)(...)color(magenta)(1).5
color(white)(..)
9.4 - 7.9 = 1.5