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最簡整數比 (英) : 最簡整數比
相關課程
- Write 15:25 as a fraction in simplest form.
- So 15 to 25 is just a ratio, and we can write it.
- So they've given us 15 to 25.
- And you can write this ratio as a fraction, as 15 over 25.
- And if we want to put this in simplest form, we just have to
- think about what is the largest number that divides
- into both 15 and 25?
- Or what is their greatest common factor?
- When you just eyeball it, you say, well, 5 goes into both of
- them, and I'm pretty sure that's the largest number that
- divides into both, so let's divide both by 5.
- If there is a larger number, then we might be able to see
- it once we've simplified it a little bit more.
- So let's divide the numerator and the denominator by 5 and
- see what we get.
- So now we get 15 divided by 5 is equal to 3.
- And 25 divided by 5 is equal to 5, and now we have 3/5.
- 3 and 5 don't share any common factors greater than 1, so it
- is in simplest form.
- So we've done what they asked.
- We've written it as a fraction in simplest form.
- We could also write this, if we want to write it in this
- type of notation, as 3:5.
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