![]() You may have noticed that I said "we need to multiply top and bottom by 100", and then I just did a single multiplication of 100 (ie multiplying the top). Sticking a % sign on the end is the same as saying "out of 100". Shorthand, you could do (50/200)*100 = 25 And then we would write the answer as "25 out of 100" or 25%. ![]() Another way of writing 25/100 is 25% (note we are not involving the % symbol in the multiplication itself). We achieve this by multiplying both top and bottom by 100. Now, remembering that percentages have 100 as the denominator, we need to get 100 on the bottom instead of 1. This could just as well be written 0.25/1. You could think of this as a fraction with 1 as the denominator.Į.g. 50/200) into a calculator, the calculator returns a decimal value. When you type a division expression (e.g. If you're using a calculator, that's where many people get confused about what multiplication to do. If you're doing this by hand with "nice" numbers, it's just a case of fraction manipulation. Then, you have an expression that can be read as "x out of 100" and, hey presto, there's your percentage. ![]() Turning a fraction into a percentage is really just a case of finding the equivalent fraction which has 100 as the denominator (ie x/ 100). You can think of % as being equivalent to writing /100. It means "out of one hundred" (literally, "per cent"). The % sign is simply a symbol with a meaning. ![]() You have then had to multiply that number by 100 in your head to get the answer I have highlighted in green.ġ00% is not really a number as such, therefore you cannot exactly "multiply by 100%".ġ00% means "100 out of 100", or 100/100. The person in red has it right when they say: the calculation you have done gives you the answer I have highlighted in yellow. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |