Solve: Combining (5/6)x + (7/8)x + (2/4)x Algebraic Expression

Fraction Operations with Mixed Denominators

56x+78x+24x= \frac{5}{6}x+\frac{7}{8}x+\frac{2}{4}x=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Multiply each factor by its number to find the common denominator
00:09 Make sure to raise both numerator and denominator by the number
00:31 Now we have a common denominator and can group factors
00:45 Note to add the numerators and keep the denominator
00:54 Each time combine 2 numbers and then continue
01:01 Break down 53 into 48 plus 5
01:06 Break down the fraction into whole number and remainder
01:12 Convert from proper fraction to whole number
01:16 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

56x+78x+24x= \frac{5}{6}x+\frac{7}{8}x+\frac{2}{4}x=

2

Step-by-step solution

First, let's find a common denominator for 4, 8, and 6: it's 24.

Now, we'll multiply each fraction by the appropriate number to get:

5×46×4x+7×38×3x+2×64×6x= \frac{5\times4}{6\times4}x+\frac{7\times3}{8\times3}x+\frac{2\times6}{4\times6}x=

Let's solve the multiplication exercises in the numerator and denominator:

2024x+2124x+1224x= \frac{20}{24}x+\frac{21}{24}x+\frac{12}{24}x=

We'll connect all the numerators:

20+21+1224x=41+1224x=5324x \frac{20+21+12}{24}x=\frac{41+12}{24}x=\frac{53}{24}x

Let's break down the numerator into a smaller addition exercise:

48+524=4824+524=2+524=2524x \frac{48+5}{24}=\frac{48}{24}+\frac{5}{24}=2+\frac{5}{24}=2\frac{5}{24}x

3

Final Answer

2524x 2\frac{5}{24}x

Key Points to Remember

Essential concepts to master this topic
  • Common Denominator: Find LCD of all denominators before adding fractions
  • Technique: Convert 24 \frac{2}{4} to 1224 \frac{12}{24} when LCD is 24
  • Check: Verify 5324=2524 \frac{53}{24} = 2\frac{5}{24} by converting back ✓

Common Mistakes

Avoid these frequent errors
  • Adding fractions without finding common denominators
    Don't just add 56+78+24=1418 \frac{5}{6} + \frac{7}{8} + \frac{2}{4} = \frac{14}{18} ! This gives completely wrong results because you can't add fractions with different denominators directly. Always find the LCD first and convert all fractions before adding.

Practice Quiz

Test your knowledge with interactive questions

\( 94+12+6= \)

FAQ

Everything you need to know about this question

How do I find the LCD of 6, 8, and 4?

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List multiples of each number: 6: 6, 12, 18, 24... 8: 8, 16, 24... 4: 4, 8, 12, 16, 20, 24... The first number that appears in all lists is 24!

Why did we get a mixed number as the answer?

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When the numerator is larger than the denominator, we convert to a mixed number. 5324 \frac{53}{24} becomes 2524 2\frac{5}{24} because 53 ÷ 24 = 2 with remainder 5.

What if I can't find a common denominator easily?

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Start with the largest denominator and check if it's divisible by the others. If not, multiply the denominators together as a last resort, then simplify later.

Do I need to simplify 2/4 before starting?

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It's helpful but not required! You can simplify 24=12 \frac{2}{4} = \frac{1}{2} first, or work with it as is. Either way leads to the same final answer.

How do I check if 2 5/24 x is correct?

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Convert back to improper fraction: 2524=48+524=5324 2\frac{5}{24} = \frac{48+5}{24} = \frac{53}{24} . Then verify: 2024+2124+1224=5324 \frac{20}{24} + \frac{21}{24} + \frac{12}{24} = \frac{53}{24}

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