Adding Fractions: Calculate 1/6 + 2/3 in Paper Usage Problem

Fraction Addition with Common Denominators

Danny bought a roll of paper and used

16 \frac{1}{6} of the paper to make a cover for the book and 23 \frac{2}{3} to make the cover of a notebook

How much of the roll did Danny use?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:11 Which part of the wrapper did Danny use?
00:14 Okay, let's put together the parts Danny used and calculate.
00:19 First, we multiply the fraction by two to find a common denominator.
00:24 Make sure to multiply both the top and bottom numbers.
00:28 Now, let's do the multiplication.
00:31 Next, we add the fractions using this common denominator.
00:37 Let's calculate the new top number, or numerator.
00:41 Great job! That's how we solve this problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Danny bought a roll of paper and used

16 \frac{1}{6} of the paper to make a cover for the book and 23 \frac{2}{3} to make the cover of a notebook

How much of the roll did Danny use?

2

Step-by-step solution

To solve this problem, we'll find out how much of the paper roll Danny used by adding the fractions representing the parts used for the book and notebook covers.

  • Step 1: Identify the fractions used.
  • Step 2: Determine the common denominator for the fractions 16 \frac{1}{6} and 23 \frac{2}{3} .
  • Step 3: Convert 23 \frac{2}{3} to the common denominator.
  • Step 4: Add the fractions.
  • Step 5: Simplify the result if needed.

Let's work through these steps:

Step 1: Danny used the fractions 16 \frac{1}{6} and 23 \frac{2}{3} .

Step 2: The denominators are 6 and 3. The least common denominator is 6.

Step 3: Convert 23 \frac{2}{3} to a fraction with a denominator of 6.

23=2×23×2=46 \frac{2}{3} = \frac{2 \times 2}{3 \times 2} = \frac{4}{6}

Step 4: Add the fractions 16 \frac{1}{6} and 46 \frac{4}{6} .

16+46=1+46=56 \frac{1}{6} + \frac{4}{6} = \frac{1 + 4}{6} = \frac{5}{6}

Step 5: The fraction 56 \frac{5}{6} is already in its simplest form.

Therefore, Danny used 56 \frac{5}{6} of the paper roll in total.

The correct answer is 56 \frac{5}{6} .

3

Final Answer

56 \frac{5}{6}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Find the least common denominator before adding fractions
  • Technique: Convert 23 \frac{2}{3} to 46 \frac{4}{6} by multiplying by 22 \frac{2}{2}
  • Check: Verify 56 \frac{5}{6} cannot be simplified further by checking GCD ✓

Common Mistakes

Avoid these frequent errors
  • Adding numerators and denominators separately
    Don't add 16+23 \frac{1}{6} + \frac{2}{3} as 39 \frac{3}{9} = 13 \frac{1}{3} ! This completely ignores the different denominators and gives a meaningless result. Always find a common denominator first, then add only the numerators.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{2}{4}+\frac{1}{4}= \)\( \)

FAQ

Everything you need to know about this question

Why can't I just add 1 + 2 and 6 + 3?

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Because fractions represent parts of different wholes! 16 \frac{1}{6} means 1 out of 6 pieces, while 23 \frac{2}{3} means 2 out of 3 pieces. You need the same-sized pieces first.

How do I find the least common denominator?

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Look for the smallest number that both denominators divide into evenly. For 6 and 3: since 6 ÷ 3 = 2, the number 6 works perfectly as our LCD.

What if the LCD is bigger than both denominators?

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That's normal! For example, with 14+16 \frac{1}{4} + \frac{1}{6} , the LCD is 12. You'd convert both fractions: 312+212=512 \frac{3}{12} + \frac{2}{12} = \frac{5}{12} .

Do I always need to simplify my final answer?

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Yes, always check! Look for common factors in the numerator and denominator. In this problem, 5 and 6 share no common factors, so 56 \frac{5}{6} is already simplified.

Can the answer be greater than 1?

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Absolutely! If Danny had used 12+34=54 \frac{1}{2} + \frac{3}{4} = \frac{5}{4} , that means he used more than one full roll. Improper fractions are perfectly valid answers.

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