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Mathematics 17 Online
OpenStudy (anonymous):

5% of 20% Its 1% .correct me if I'm wrong :)

OpenStudy (hba):

.-.

OpenStudy (anonymous):

I'm not a maths student but need to do it for a test so I'm practicing . :/

ganeshie8 (ganeshie8):

You're right ! 5% of 20% 5% * 20% 5/100 * 20/100 1/100 1%

OpenStudy (anonymous):

Thank ya :)

OpenStudy (anonymous):

Darn you. It's for a test!? Ok well, in that case, when you need to find a percent of a percent - Turn each percent into a decimal: Where 2% for example is 0.02 - What we do is move the decimal to the left two units. Another example 50% is like 50.0% and if we move the decimal to the left two units we get 0.50 and that represents 50% as a decimal. When we say Some % of some Other %, like in your case 5% of 20%... Multiply the decimals together... 5% = 0.05, 20% = 0.20 for 0.20 X 0.05 and when you get your decimal, multiply it by one hundred (move the decimal to the right two places) and that becomes your %

OpenStudy (ikram002p):

@sarah786 ^^

OpenStudy (anonymous):

Its is not my test I'm preparing for test . thanks cosmic And Ikram ^-^

ganeshie8 (ganeshie8):

yes another way to look at is by taking a good number such as 100 : 5% of 20% of 100 5% of 20 1 since 1 is 1% of 100, 5% of 20% is 1%

OpenStudy (anonymous):

Wow thanks for such a awesome explanation ganeshiew but if in question like % of 3.5 kg is 70 grams ?

OpenStudy (anonymous):

Let's make the units the same first: 3.5kg = 3500g Then set 70g over this: 70g/3500g and do the division: 0.02 Remember above how I told you to multiply the decimal by one hundred... move it to the right two places? This brings 0.02 to 2.0 And this means 2%. 70g is 2% of 3.5kg

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