Solve the Fraction Equation: Finding the Missing Addend in 2/8 + ? = 3/5

Question

28+?=35 \frac{2}{8}+?=\frac{3}{5}

Video Solution

Solution Steps

00:00 Find the unknown
00:04 Arrange the equation and isolate the unknown
00:15 We want to find the smallest common denominator
00:20 Multiply each fraction by the second denominator to find the common denominator
00:26 Remember to multiply both numerator and denominator
00:37 Calculate the multiplications
00:47 Add under the common denominator
00:50 Calculate the numerator
00:56 Reduce the fraction as much as possible
01:02 Remember to divide both numerator and denominator
01:09 And this is the solution to the question

Step-by-Step Solution

To solve this problem, we'll proceed with the following steps:

  • Step 1: Simplify the fraction 28 \frac{2}{8} .
  • Step 2: Determine a common denominator for 14 \frac{1}{4} and 35 \frac{3}{5} .
  • Step 3: Subtract 14 \frac{1}{4} from 35 \frac{3}{5} with this common denominator.
  • Step 4: Simplify the result if necessary.

Now, let's work through each step:

Step 1: Simplify 28 \frac{2}{8} to 14 \frac{1}{4} since both 2 and 8 share a common factor of 2.
Step 2: Calculate the least common denominator (LCD) for 14 \frac{1}{4} and 35 \frac{3}{5} .
The LCD of 4 and 5 is 20.
Rewrite 14 \frac{1}{4} as 520 \frac{5}{20} and 35 \frac{3}{5} as 1220 \frac{12}{20} .

Step 3: Subtract the fractions: 1220520=720 \frac{12}{20} - \frac{5}{20} = \frac{7}{20} .

Therefore, the missing fraction needed to satisfy the original equation is 720 \frac{7}{20} .

Thus, the solution to the problem is 720 \frac{7}{20} .

Answer

720 \frac{7}{20}