Solve: 4/6 - 1/3 - 1/12 Fraction Subtraction Problem

Fraction Subtraction with Multiple Denominators

4613112= \frac{4}{6}-\frac{1}{3}-\frac{1}{12}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's tackle this problem together!
00:09 First, we need to find the least common denominator.
00:13 So, multiply each fraction's denominator by 2 and 4 respectively.
00:19 Don't forget, multiply both the numerator and the denominator.
00:25 Now, let's perform these multiplications.
00:36 Next, subtract under the new common denominator.
00:40 Then, calculate the new numerator.
00:48 We'll reduce the fraction as much as possible.
00:52 Remember, divide both the numerator and denominator evenly.
00:57 And that's how we solve the question! Great job!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

4613112= \frac{4}{6}-\frac{1}{3}-\frac{1}{12}=

2

Step-by-step solution

Let's try to find the lowest common denominator between 6, 3, and 12

To find the lowest common denominator, we need to find a number that is divisible by 6, 3, and 12

In this case, the common denominator is 12

Now we'll multiply each fraction by the appropriate number to reach the denominator 12

We'll multiply the first fraction by 2

We'll multiply the second fraction by 4

We'll multiply the third fraction by 1

4×26×21×43×41×112×1=812412112 \frac{4\times2}{6\times2}-\frac{1\times4}{3\times4}-\frac{1\times1}{12\times1}=\frac{8}{12}-\frac{4}{12}-\frac{1}{12}

Now let's subtract:

84112=4112=312 \frac{8-4-1}{12}=\frac{4-1}{12}=\frac{3}{12}

Let's divide both numerator and denominator by 3 and we get:

3:312:3=14 \frac{3:3}{12:3}=\frac{1}{4}

3

Final Answer

14 \frac{1}{4}

Key Points to Remember

Essential concepts to master this topic
  • LCD Rule: Find common denominator of 6, 3, and 12
  • Conversion: Convert 46 \frac{4}{6} to 812 \frac{8}{12} , 13 \frac{1}{3} to 412 \frac{4}{12}
  • Verification: Check 812412112=312=14 \frac{8}{12} - \frac{4}{12} - \frac{1}{12} = \frac{3}{12} = \frac{1}{4}

Common Mistakes

Avoid these frequent errors
  • Subtracting denominators along with numerators
    Don't subtract 4/6 - 1/3 - 1/12 by doing (4-1-1)/(6-3-12) = 2/(-9)! You can only subtract numerators when denominators are the same. Always find the LCD first and convert all fractions before subtracting.

Practice Quiz

Test your knowledge with interactive questions

Without calculating, determine whether the quotient in the division exercise is less than 1 or not:

\( 5:6= \)

FAQ

Everything you need to know about this question

How do I find the LCD of 6, 3, and 12?

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Look for the smallest number that all three denominators divide into evenly. Since 12 ÷ 6 = 2, 12 ÷ 3 = 4, and 12 ÷ 12 = 1, the LCD is 12.

Why do I multiply 46 \frac{4}{6} by 2/2?

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To get denominator 12, you need to multiply 6 by 2. When you multiply the denominator by 2, you must also multiply the numerator by 2 to keep the fraction equivalent: 4×26×2=812 \frac{4 \times 2}{6 \times 2} = \frac{8}{12} .

Can I simplify 46 \frac{4}{6} to 23 \frac{2}{3} first?

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Yes! Simplifying first can make the problem easier. 46=23 \frac{4}{6} = \frac{2}{3} , so the problem becomes 2313112 \frac{2}{3} - \frac{1}{3} - \frac{1}{12} , which is simpler to work with.

What if I get a different LCD?

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Any common multiple will work, but using the LCD makes calculations easier. If you use 24 instead of 12, you'll get the same final answer, just with bigger numbers along the way.

How do I know when to reduce my final answer?

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Always check if the numerator and denominator share any common factors. Since 3 and 12 both divide by 3: 312=14 \frac{3}{12} = \frac{1}{4} .

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