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.
How to Calculate. 1  Percentage Change: a positive value is an increase, a negative value is a decrease. 2  Percentage Error: ignore a minus sign (just leave it off), unless you want to know if the error is under or over the exact value. Percentage Difference: ignore a minus sign, because neither value is more important, so being above or below does not make sense. Step 4: Convert this into a percentage (multiply by 100 and add a % sign) The Formulas (Note: the | symbols mean absolute value, so negatives become positive.) Percent Change = New Value â Old Value|Old Value| Ã 100%