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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.
What else can I help you with?
How Subtract 1 over 3 subtracting one over 3?
Anything minus itself equals zero.
How can using the GCF and LMC help you you add subtract and multiply fractions?
In order to add or subtract fractions, the denominator (bottom number) has to be the same. In order to make it the same, you find the LCM and multiply the fraction by whatever is necessary to make the denominator the LCM. FOR EXAMPLE: 1/3 + 2/5 The LCM of 3 and 5 is 15. To make the 3 in 1/3 15, you multiply the whole fraction by 5 over 5 (it simplifies to 1 so you aren't really changing the fraction by multiplying it by 1). 1/3 * 5/5 is 5/15 You multiply 2/5 times 3 over 3 using the same principle 2/5 * 3/3 is 6/15 NOW you can add 5/15 and 6/15 to get 11/15.
What is a common demoniator?
The bottom number of a fraction is called the denominator. In order to add and subtract fractions with different denominators, it is necessary to make them the same, or "common." Example: 1/4 + 1/5. The common denominator is 20. 1/4 = 5/20 1/5 = 4/20 1/4 + 1/5 = 5/20 + 4/20 = 9/20
What is the rename least common denominator of 13 and 518?
If 13 and 518 are both denominators, the LCD is 6734 If that's 1/3 and 5/18, the LCD is 18 and you can change 1/3 to 6/18
What is 3 over 4 times 7 over 15 equal?
One "subtracts" or "subtracts from." I'm not sure how to "subtract by." Whatever.3/7 = 6/146/14 - 4/14 = 2/14 or 1/74/14 - 6/14 = -2/14 or -/1/7
Why is it necessary to rename 4 and 1 fourth if you subtract 3 fourths from it?
Because you cannot subtract 3/4 from 1/4.
Why it is necessary to rename 4 1 4th if you subtract 3th from it?
Probably not, but it depends on what you mean by "3th".
How do you rename 3 over 2 as a mixed number?
1 1/2
What does find the common denominator for the fraction pairs mean?
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
What is 1 over 2 subtract 1 over 6?
1/3
Why is it necessary to rename four and one quarter when subtracting three quarter from it?
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.
What is 144 subtract 1 over 4?
The answer is 143.75
What is 3 over 9 subtract 4 over 9?
-1/9
What is 3 over 4 subtract 1 over 6?
It is: 7/12
What is the lcd of 5 over 9 subtract 1 over 6?
18
Can you subtract 1 over 12 and 1 over 12?
Yes. Anything minus itself is zero.
What is 7 over 8 subtract 3 over 4 equal?
1 over 8
