#4-:0.5# or #4/0.5# can easily be simplified. Think of it this way: if you were to divide 4 slices of pizza in half, how many slices would you then have? Remember, #0.5# equals #1/2#.
#1# slice cut in half would equal #2# slices. So you can think of this as a multiplication question as well. If #1# slice cut in half equals #2# slices, then #4# slices cut in half would then equal how many slices?
Or, you can think of it this way. How many "half " slices would it take to make #4# whole slices?
#0.5 + 0.5 = 1# slice
#0.5 + 0.5 = 1# (now #2# slices)
#0.5 + 0.5 = 1# (now #3# slices)
#0.5 + 0.5 = 1# slices (now #4# slices)
It would take a total of #8# half slices to make 4 whole slices. So #4# divided by #0.5# equals #8#.
#4-:0.5=8#
