I had the MS Calculator set to standard not scientific, when I changed to scientific I got the correct percentage number.
How come you multiple the number again;
2345 - .45 x /2345/ ?
You have the number and you want to reduce it by 45%. First you calculate what 45% of the number is and then you would subtract it from the number.
In mathematics, you don't understand things. You just get used to them.
I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.