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How much do you need to add to -6 to make 6?
You need to add 12.
What do you need to add to -6 to get 1?
You need to add 7 (or +7)
What is 2 over 3 add 1 over 2?
7/6 or 1 1/6 If you want to add 2/3 and 1/2 you first need to find a common denominator. In this case, 6 is the least common denominator. Then you rewrite the fractions with the new denominator. 2/3=4/6 and 1/2=3/6. Now you can add them. 4/6+3/6=7/6 and 7/6 is the same as 1 and 1/6.
When do you need to find the Least common denominator in a problem?
Least common denominators or LCDs are very important when adding fractions.For example, if we want to add 1/2 and 1/3 we need to make them look the same. That is to say we can only add like things. So we find the LCD which is 6 in this case. 1/2 is 3/6 and 1/3 is 2/6. Now we can add these and we have 5/6.Without the LCD we could not add these or many other fractions.We extend this idea when we add rational expressions.
How do you add dissimilar fractions with mixed number?
You can add the whole part of the numbers separately - no need to convert those. Then add the fractional parts in the usual way, i.e., find a common denominator, convert the fractions to this denominator, and add the numerators. Here is an example: 5 1/2 + 3 2/3 Add the whole part and the fractional part separately: 8 + (1/2 + 2/3) Convert to a common denominator: 8 + (3/6 + 4/6) Add the fractional part: 8 7/6 Since in this case 7/6 is greater than 1, you need to subtract one, and add one to the whole part: 7 1/6
