Because you cannot subtract 3/4 from 1/4.
Oh, dude, renaming the fractional sum when adding mixed numbers is like wearing a hat indoors - it's not necessary, but it might make things a bit fancier. Technically, you can add mixed numbers without renaming the sum, but it can make the math simpler and easier to understand. So, like, you do you - rename or not, it's all good.
Renaming is the same thing as borrowing. If the problem was 62 - 35 you would have to rename the 2 ....12...by borrowing from the 6.which would become 5. In your example there is no need to rename since 65 - 32 can be subtracted without borrowing.
To convert it to a common denominator.
1 1/2
460 = 400 + 60 = 300 + 160
Probably not, but it depends on what you mean by "3th".
7 3 _ 4
12 fourths is neither a mixed number nor a fraction. It is an integer: 3.
Because 3 is greater than 1. I suppose it's possible to do it in your head, if you remember that in the world of fourths, 1 - 3 equals 2 but it's easier to subtract 3/4 from 17/4 or 3 and 5/4. As long as you can get to 3 and 1/2, it doesn't really matter, but don't tell your teacher I said that.
you would have to convert the units to be alike.
No.
No.
Possible reasons: To add or subtract fractions, To compare fractions with different denominators.
If you can do it without, go ahead. But it helps to get the correct answer, since three is larger than one. If you re-name 4 and 1/4 to 3 and 5/4, it's easier to subtract 3/4 from it.
You first need to find a common denominator, not necessarily the least common denominator. Next, you rename the fractions according to the common denominator. Only then can you subtract the fractions. After subtraction you should simplify the answer.
to be for real i truly don't know but first you need to make the units the same and that's called renaming the you subtract
It means find the LCM of the denominators. In order to add and subtract fractions with unlike denominators, it is necessary to convert them to equivalent fractions with a common denominator. Example: 1/4 + 1/6 The LCM of 4 and 6 is 12. 1/4 = 3/12 1/6 = 2/12