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分數轉成小數 (例子2 英語) : 分數轉成小數 (例子2)
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- Let's see if we can write the fraction "11 over 25" (or we can call it "eleven twenty-fifths") to see if we can write that as a decimal
- and we're gonna round it to the nearest thousands place.
- And so another way of viewing this, eleven over twenty-five,
- this is the same thing as eleven divided by twenty-five,
- so we can literally say, we can literally divide 25 into 11 and whatever we get
- that is going to be the decimal representation of 11/25.
- And, since we're going to go into the places less than the ones place
- we're gonna go into the tenths place and the hundredths place and the thousandths place,
- let's add some zeroes to this eleven right over here after the decimal
- and now let's start to divide.
- 25 doesn't go into 1
- 25 doesn't go into 11.
- 25 does go into 110.
- So, when 25 goes into 110 four times (4 x 25 is 100), so it goes into it 4 times
- let's keep the decimal up here, so we'll write 0.4
- 4 times 25 is 100, and now we can subtract: 110 minus 100 is 10.
- And now we can bring down another zero.
- 25 goes into 100 exactly four times. 4 x 25 is 100, and then you subtract and you get zero.
- so we actually didn't even have to round this one. This fraction is exactly, this is exactly 0.44.
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