Compare Fractions: Find the Symbol Between 5/12 and 7/8

Question

Fill in the missing sign:

51278 \frac{5}{12}☐\frac{7}{8}

Video Solution

Solution Steps

00:00 Choose the correct sign
00:03 We want to find a common denominator for fractions to compare
00:10 Multiply the left fraction by 2
00:16 This is the left fraction with the common denominator
00:22 Now let's convert the right fraction to the common denominator
00:26 Multiply numerator and denominator by 3
00:30 This is the right fraction with the common denominator
00:39 We can see that the right fraction is larger
00:46 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the least common multiple (LCM) of the denominators 12 and 8.
  • Step 2: Convert each fraction to have this common denominator.
  • Step 3: Compare the converted fractions by examining their numerators.

Let's proceed with the solution:
Step 1: The LCM of 12 and 8 needs to be found. The factorization of 12 is 22×3 2^2 \times 3 and for 8 is 23 2^3 . The LCM is 23×3=24 2^3 \times 3 = 24 . Therefore, the common denominator is 24.

Step 2: Convert each fraction to the new denominator:

  • Convert 512 \frac{5}{12} : The equivalent fraction is found by multiplying both the numerator and the denominator by a number that equals the common denominator when the original denominator is multiplied by it. 24÷12=2 24 ÷ 12 = 2 . Thus, multiply both the numerator and denominator by 2: 5×212×2=1024 \frac{5 \times 2}{12 \times 2} = \frac{10}{24} .
  • Convert 78 \frac{7}{8} : Similarly, multiply by 24÷8=3 24 ÷ 8 = 3 : 7×38×3=2124 \frac{7 \times 3}{8 \times 3} = \frac{21}{24} .

Step 3: Compare the two equivalent fractions 1024 \frac{10}{24} and 2124 \frac{21}{24} . Comparing the numerators while the denominators are the same: 10 < 21.

Therefore, 512 \frac{5}{12} is less than 78 \frac{7}{8} .

Thus, the correct sign to fill in is < < .

Answer

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