There is none because Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
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The lcm or lcd is 5751
0.0282
42 = 21 x 31 x 71 126 = 21 x 32 x 71 210 = 21 x 31 x 51 x 71 Take the lowest power of the common primes: hcf of 42, 126 & 210 is 21 x 31 x 71 = 42.
The least common denominator for 7, 8, and 10 is 280. Using the exponential method: 7 = 71 8 = 2 x 2 x 2 = 23 10 = 21 x 51 and the product of the largest exponential of each prime is 23 x 51 x 71 = 8 x 5 x 7 = 280
The common factor is 3. (105 = 35 x 3, 12 = 4 x 3).The least common denominator is 420.105 = 3 x 5 x 712 = 22 x 3Highest exponents method: 22 x 31 x 51 x 71 = 420