Vitamins are classified as either fat soluble (vitamins A, D, E and K) or water soluble (vitamins B and C). This difference between the two groups is very important. It determines how each vitamin acts within the body.
Rule 3: Subtracting a negative number from a negative numberâwhen you see the subtraction (minus) sign followed by a negative sign, turn the two signs into a plus sign. Thus, instead of subtracting a negative, you are adding a positive.So, â -5 becomes +5, and continue normally with the addition.ou can also think about these problems as addition problemsâyou add the numbers together (5 + 3 = 8) and then, since both numbers have a minus sign in front of them, you would add a negative sign in front of your answer, like this: -8.
1 A positive number multiplied by a negative gives a negative 20 x -4 = -80. 2  A positive number divided by a negative gives a negative 20 / -4 = -5. 3  A negative number multiplied by a negative gives a positive -20 x -4 = 80.  A negative number divided by a negative gives a positive -20 / -4 = 5.