Solve: 7⅔ + 6⅙ + 4⅑ Mixed Number Addition Problem

Mixed Number Addition with Multiple Denominators

723+616+419=? 7\frac{2}{3}+6\frac{1}{6}+4\frac{1}{9}=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 First, let's separate the whole numbers and add them
00:13 This is the sum of whole numbers, now let's move to fractions
00:27 Multiply each fraction by the appropriate factor to find the common denominator
00:50 Calculate the multiplications
01:01 Add with the common denominator
01:08 This is the sum of fractions, now let's add it to the sum of numbers
01:17 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

723+616+419=? 7\frac{2}{3}+6\frac{1}{6}+4\frac{1}{9}=\text{?}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert mixed numbers to improper fractions.
  • Step 2: Find a common denominator.
  • Step 3: Add the fractions.
  • Step 4: Convert the resulting improper fraction back to a mixed number.

Now, let's work through each step:

Step 1: Convert each mixed number to an improper fraction.

  • 723=7×3+23=233 7\frac{2}{3} = \frac{7 \times 3 + 2}{3} = \frac{23}{3}
  • 616=6×6+16=376 6\frac{1}{6} = \frac{6 \times 6 + 1}{6} = \frac{37}{6}
  • 419=4×9+19=379 4\frac{1}{9} = \frac{4 \times 9 + 1}{9} = \frac{37}{9}

Step 2: Find a common denominator for the fractions.

The denominators are 3, 6, and 9. The least common multiple (LCM) is 18.

Step 3: Convert all fractions to have this common denominator.

  • 233=23×63×6=13818 \frac{23}{3} = \frac{23 \times 6}{3 \times 6} = \frac{138}{18}
  • 376=37×36×3=11118 \frac{37}{6} = \frac{37 \times 3}{6 \times 3} = \frac{111}{18}
  • 379=37×29×2=7418 \frac{37}{9} = \frac{37 \times 2}{9 \times 2} = \frac{74}{18}

Step 4: Add the fractions.

13818+11118+7418=32318 \frac{138}{18} + \frac{111}{18} + \frac{74}{18} = \frac{323}{18}

Step 5: Convert this improper fraction back to a mixed number.

Divide 323 by 18.

323÷18=17 323 \div 18 = 17 with a remainder of 17, so

32318=171718 \frac{323}{18} = 17\frac{17}{18}

Therefore, the solution to the problem is 171718 17\frac{17}{18} .

3

Final Answer

171718 17\frac{17}{18}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions first
  • Technique: Find LCM of denominators: LCM(3,6,9) = 18
  • Check: Verify 171718=323÷18=17 17\frac{17}{18} = 323 ÷ 18 = 17 remainder 17 ✓

Common Mistakes

Avoid these frequent errors
  • Adding whole numbers and fractions separately
    Don't add 7+6+4=17 then add 2/3+1/6+1/9 separately = wrong answer! The fractions don't have common denominators and can't be added directly. Always convert to improper fractions first, then find the common denominator.

Practice Quiz

Test your knowledge with interactive questions

\( 2\frac{2}{5}+2\frac{2}{5}= \)

FAQ

Everything you need to know about this question

Why can't I just add the whole numbers and fractions separately?

+

You can't add fractions with different denominators directly! 23+16+19 \frac{2}{3} + \frac{1}{6} + \frac{1}{9} needs a common denominator first. Converting to improper fractions keeps everything organized.

How do I find the LCM of 3, 6, and 9?

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List multiples of each: 3: 3, 6, 9, 12, 15, 18... 6: 6, 12, 18... 9: 9, 18... The smallest number that appears in all lists is 18!

What if my final answer is an improper fraction?

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Always convert improper fractions back to mixed numbers! Divide the numerator by denominator: 32318=171718 \frac{323}{18} = 17\frac{17}{18} because 323 ÷ 18 = 17 remainder 17.

How do I convert a mixed number to an improper fraction?

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Use the formula: whole × denominator + numerator. For 723 7\frac{2}{3} : (7 × 3) + 2 = 21 + 2 = 23, so 233 \frac{23}{3} .

Can I check my answer by converting back to decimals?

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Yes! Convert each mixed number to decimal and add: 7⅔ = 7.667, 6⅙ = 6.167, 4⅑ = 4.111. Sum = 17.944... which equals 171718 17\frac{17}{18} !

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