Let us see this calculation with a good example. Suppose Mariano Rivera of the New York Yankees, has pitched 72 innings. Let's also assume that over those innings he's allowed 6 earned runs. The best way to get his era formula is as follows: we divide 6 by 72 divided by 9 or ERA = 6/(72/9). Since 72/9 is 8, the calculation simplifies to ERA = 6/8 or 0.75; not too shabby an earned run average. In this calculation we conducted the 72/9 calculation initially however we're able to use the principle that dividing is the same as multiplying by the reciprocal. This is a great little trick to getting the ERA.
The way we do this is the following:
we now convert using era formula 6/(72/9) to 6*(9/72) which becomes 54/72, and this simplifies to 3/4, or 0.75. Thus to get the era in baseball fast, choose the earned runs and multiply them by 9; then divide by the number of innings pitched. Calculating his ERA by using era formula is going to likely probably soon be 18*9/100 or 162/100 or even 1.62. Now that you are aware of this neat little means to acquire the ERA, you will show your friends what a true baseball fan you're.
The Earned Runs can be a pitcher's best friend or worst nightmare. Regardless of how that stat is clearly calculated, the lower the number the higher for that pitcher. Really a pitcher that may end the season with an ERA of under 2, would be quite pleased, provided the pitcher threw at 50 or more innings. A pitcher few appearances may have the ERA work very favorably though he didn't allow any runs; whereas a pitcher who drove for 1 inning, yet let 10 runs, would have a disastrous ERA.
Yet how can we arrive at this calculation and exactly what exactly does this have to do with complex fractions? A complex percentage you may remember, is a fraction which contains in the numerator, the denominator, or even possibly, a different percentage. This is the reason why it's thought complex. The earned run average in baseball would be computed by taking the sum total of earned runs and dividing that by the amount of innings pitched separated by eight. This"double branch" in the previous sentence is where our complex fraction comes in.