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Which correctly renames 
(7)/(8) and 
(5)/(6) using a common denominator?
A. 
(42)/(48) and 
(40)/(48)
B. 
(42)/(48) and 
(30)/(48)
C. 
(14)/(16) and 
(15)/(18)
D. 
(28)/(24) and 
(20)/(24)

Which correctly renames 78 \frac{7}{8} and 56 \frac{5}{6} using a common denominator?\newlineA. 4248 \frac{42}{48} and 4048 \frac{40}{48} \newlineB. 4248 \frac{42}{48} and 3048 \frac{30}{48} \newlineC. 1416 \frac{14}{16} and 1518 \frac{15}{18} \newlineD. 2824 \frac{28}{24} and 2024 \frac{20}{24}

Full solution

Q. Which correctly renames 78 \frac{7}{8} and 56 \frac{5}{6} using a common denominator?\newlineA. 4248 \frac{42}{48} and 4048 \frac{40}{48} \newlineB. 4248 \frac{42}{48} and 3048 \frac{30}{48} \newlineC. 1416 \frac{14}{16} and 1518 \frac{15}{18} \newlineD. 2824 \frac{28}{24} and 2024 \frac{20}{24}
  1. Find Common Denominator: To find a common denominator for the fractions (78)(\frac{7}{8}) and (56)(\frac{5}{6}), we need to find the least common multiple (LCM) of the denominators 88 and 66.
  2. Calculate Least Common Multiple: The multiples of 88 are 88, 1616, 2424, 3232, 4040, 4848, and so on. The multiples of 66 are 66, 1212, 8800, 2424, 8822, 8833, 8844, 4848, and so on. The least common multiple of 88 and 66 is 2424.
  3. Convert Fractions to Equivalent: Now we need to convert each fraction to an equivalent fraction with the denominator of 2424. For (78)(\frac{7}{8}), we multiply both the numerator and the denominator by 33 to get (7×38×3)=(2124)(\frac{7\times 3}{8\times 3}) = (\frac{21}{24}). For (56)(\frac{5}{6}), we multiply both the numerator and the denominator by 44 to get (5×46×4)=(2024)(\frac{5\times 4}{6\times 4}) = (\frac{20}{24}).
  4. Check Answer Choices: We check the answer choices to see which one matches our calculations.\newlineA. (42)/(48)(42)/(48) and (40)/(48)(40)/(48) - This is incorrect because the common denominator is 4848, not 2424.\newlineB. (42)/(48)(42)/(48) and (30)/(48)(30)/(48) - This is incorrect because the common denominator is 4848, not 2424, and the numerators do not match our calculations.\newlineC. (14)/(16)(14)/(16) and (15)/(18)(15)/(18) - This is incorrect because the common denominator is not 2424.\newlineD. (40)/(48)(40)/(48)11 and (40)/(48)(40)/(48)22 - This is incorrect because the numerator for the first fraction does not match our calculation.
  5. Error in Answer Choices: None of the answer choices match our calculations of (21)/(24)(21)/(24) and (20)/(24)(20)/(24). There seems to be an error in the provided answer choices.

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