Solve 5 + (4/7 ÷ 2): Complex Fraction Addition Problem

Complex Fraction Division with Mixed Numbers

5+472= ? 5+\frac{\frac{4}{7}}{2}=\text{ ?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Convert division to multiplication with reciprocal
00:07 Always solve multiplication and division before addition and subtraction, simplify
00:12 And this is the solution to the question

Step-by-step written solution

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1

Understand the problem

5+472= ? 5+\frac{\frac{4}{7}}{2}=\text{ ?}

2

Step-by-step solution

To simplify the fraction exercise, we will multiply 47 \frac{4}{7} by 12 \frac{1}{2} .

We will then rearrange the exercise accordingly and following the order of operations rules, we will first solve the multiplication exercise:

5+47×12= 5+\frac{4}{7}\times\frac{1}{2}=

Note that in the multiplication exercise, we can reduce 4 in the numerator and 2 in the denominator by 2:

5+27×11=5+27+1 5+\frac{2}{7}\times\frac{1}{1}=5+\frac{2}{7}+1

Finally we will combine the whole numbers to get:

5+1+27=627 5+1+\frac{2}{7}=6\frac{2}{7}

3

Final Answer

627 6\frac{2}{7}

Key Points to Remember

Essential concepts to master this topic
  • Division Rule: Dividing by a number means multiplying by its reciprocal
  • Technique: 47÷2=47×12=27 \frac{4}{7} ÷ 2 = \frac{4}{7} × \frac{1}{2} = \frac{2}{7}
  • Check: Convert final answer: 627=447 6\frac{2}{7} = \frac{44}{7} , verify by substitution ✓

Common Mistakes

Avoid these frequent errors
  • Adding 5 to the complex fraction without simplifying first
    Don't try to add 5 + 472 \frac{\frac{4}{7}}{2} directly = confusion and wrong answers! The complex fraction must be simplified first. Always convert the division to multiplication by the reciprocal, then add the whole number.

Practice Quiz

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\( 100+5-100+5 \)

FAQ

Everything you need to know about this question

What exactly is a complex fraction?

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A complex fraction has fractions in the numerator, denominator, or both! In this problem, 472 \frac{\frac{4}{7}}{2} has a fraction in the numerator and a whole number in the denominator.

Why do I multiply by the reciprocal instead of just dividing?

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Because division by a number is the same as multiplication by its reciprocal! So 47÷2=47×12 \frac{4}{7} ÷ 2 = \frac{4}{7} × \frac{1}{2} . This makes the calculation much easier.

How do I know when to convert to mixed numbers?

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Look at your answer choices! If they're given as mixed numbers like 627 6\frac{2}{7} , convert your improper fraction. If they're improper fractions, leave your answer as an improper fraction.

Can I simplify before doing the operations?

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Yes, and you should! In 47×12 \frac{4}{7} × \frac{1}{2} , you can reduce 4 and 2 by their common factor of 2 to get 27×11=27 \frac{2}{7} × \frac{1}{1} = \frac{2}{7} .

What's the order of operations here?

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Follow PEMDAS! First simplify the complex fraction (division), then add to 5. So: 5+47÷2=5+27=627 5 + \frac{4}{7} ÷ 2 = 5 + \frac{2}{7} = 6\frac{2}{7} .

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