The common denominator of any two or more whole numbers, such as 5 7 and 8, will always be one (1) because 'common denominator' refers to the denominators of two or more fractions or mixed numbers, not whole numbers. So, a set of whole numbers (x,x) would have to be converted to their fraction equivalents, i.e., x/1, which will always yield a denominator of 1.
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Well, honey, to rewrite 5/8 and 7/10 with the least common denominator, you first need to find the least common multiple of 8 and 10, which is 40. Then, you can rewrite 5/8 as 25/40 and 7/10 as 28/40. Voila! Now you have them both with the same denominator, making it easier to compare those sassy fractions.
120.
280. 8 = 23 10 = 2 x 5 14 = 2 x 7 lcd = 23 x 5 x 7 = 280
First you need a common denominator: 3/4 and 5/8, the common denominator is 8. (4x2=8, 8x1=8) Multiply both the numerator and denominator of 3/4 by 2 so that it becomes 6/8. Now that a common denominator is established, you may subtract them with ease. 6/8 - 5/8 = 1/8.
1 - 1/8 First convert both to common denominator. 1 = 8/8 1 - 1/8 = 8/8 - 1/8 Next, subtract the numerators. 8 - 1 = 7 Put the difference between the numerators above the common denominator. 8/8 - 1/8 = 7/8 7/8 is your answer.