There is none because the 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 LCD of 7 and 77 is 77.
33/7 - 22/21 the least common denominator is 21 = (33 x 3)/(7 x 3) - 22/21 = 99/21 - 22/21 = 77/21 = (77 ÷ 7/(21 ÷ 7) = 11/3 =3 2/3
The greatest common factor of 77 and 121 is 11, so you can reduce the fraction 77/121 by dividing both the numerator and denominator by 11 to get 7/11.
Look at the prime factorisation of both numbers: 22 = 2 * 11 77 = 7 * 11 There is only one common factor and that is 11.
The greatest common factor of 77 and 143 is 11.