Respuesta :
Place one number above the other so that the hundreds, tens and ones
places are lined up. Draw a line under the bottom number.
AMA try to help by doing an example
335
+123
---------
458
First start from right to left for example 5+ 3 witch is 8 then continue : )
335
+123
---------
458
First start from right to left for example 5+ 3 witch is 8 then continue : )