Solve the Fraction Subtraction: 7/8 minus 5/12

Question

Solve the following exercise:

78512=? \frac{7}{8}-\frac{5}{12}=\text{?}

Video Solution

Solution Steps

00:00 Solve
00:03 We want to find the least common denominator
00:06 Multiply by 3 and 2 respectively to find the common denominator
00:09 Make sure to multiply both numerator and denominator
00:21 Calculate the multiplications
00:29 Subtract with the common denominator
00:36 Calculate the numerator
00:40 And this is the solution to the question

Step-by-Step Solution

To solve the problem of subtracting 512\frac{5}{12} from 78\frac{7}{8}, we follow these steps:

  • Step 1: Find the least common multiple (LCM) of the denominators 8 and 12. The multiples of 8 are 8, 16, 24, 32, and those of 12 are 12, 24, 36. The smallest common multiple is 24.
  • Step 2: Convert each fraction to have a denominator of 24.
    For 78\frac{7}{8}:
    Multiply the numerator and the denominator by 3 to get: 7×38×3=2124\frac{7 \times 3}{8 \times 3} = \frac{21}{24}.
    For 512\frac{5}{12}:
    Multiply the numerator and the denominator by 2 to get: 5×212×2=1024\frac{5 \times 2}{12 \times 2} = \frac{10}{24}.
  • Step 3: Subtract the fractions now that they have the same denominator:
    21241024=211024=1124\frac{21}{24} - \frac{10}{24} = \frac{21 - 10}{24} = \frac{11}{24}.
  • Step 4: Simplify the fraction if possible. In this case, 1124\frac{11}{24} is already in its simplest form.

Therefore, the result of 78512\frac{7}{8} - \frac{5}{12} is 1124\frac{11}{24}.

Answer

1124 \frac{11}{24}