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Well, honey, if you're missing a numerator, you better start by looking under the couch cushions or in the junk drawer - just kidding! To find a missing numerator in a fraction, you'll need to use some good old-fashioned algebra. Set up an equation with the fraction, solve for the missing numerator by cross multiplying, and voila, you've found that sneaky little number.
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SteveOh, dude, finding a missing numerator is like finding your keys in the morning - you just gotta look for it. So, if you have a fraction with a missing numerator, you can solve for it by setting up an equation where the fraction equals a known value and then solve for the missing numerator. It's not rocket science, but hey, it's math!
When doing changing fractions to equivalent fractions, if you multiply or divide the denominator by a number, you have to do the same to the numerator. Here is an example:
2/3 + 4/5 =
To find the LCM of 3 and 5, list the multiples of each until you find one that they have in common:
3, 6, 9, 12, 15, 18...
5, 10, 15, 20...
15 is the LCM.
To change the 3 in 2/3 to 15, multiply it by 5. Since you multiplied 3 by 5, you have to multiply the 2 by 5. The equialent fraction is 10/15.
To change the 5 in 4/5 to 15, multiply it by 3. 3 x 5 = 15. Now, you have to do the same to the numerator 4. 3 x 4 = 12. The fraction is 12/15.
Now, you can add the fractions together:
10/15 + 12/15 = 22/15, but it is an improper fraction, so you need to change it to a mixed number. To find the whole number, divide the numberator by the denominator. 22 divided by 15 is 1 with a remainder of 7. Use the 7 as the numerator and the 12 (the number you divided by) as the denominator.
The answer is 1 7/12. It is in simplest form because 7 is a Prime number that will not divide evenly into 12.
If you have 2 fractions like this: 2/4 and ?/8 First, 8 Divided by 4 is 2, so multiply 2x2, equals 4. The answer is 4/8
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