Solve Mixed Number Division: 2⅐ ÷ ¼ Step-by-Step

Mixed Number Division with Fraction Reciprocals

+217:+14= ? +2\frac{1}{7}:+\frac{1}{4}=\text{ ?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's begin by solving this problem.
00:12 Remember, a positive number divided by another positive number always gives a positive result.
00:25 First, change the mixed fraction to an improper fraction. This makes it easier to work with.
00:59 Great! Now, let's substitute this fraction into our exercise.
01:11 Next, remember that dividing by a fraction is like multiplying by its reciprocal.
01:21 So, switch the numerator and the denominator.
01:31 Now, multiply the numerators together and the denominators together.
01:45 Let's break down sixty into fifty-six plus four. This will help us with our calculations.
01:53 Separate the fraction into a whole number and a remainder.
01:58 Once simplified, convert the improper fraction back to a whole number.
02:08 And there you have it! That's how you solve the question. Well done!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

+217:+14= ? +2\frac{1}{7}:+\frac{1}{4}=\text{ ?}

2

Step-by-step solution

Let's first convert 2 and seven-sevenths into a simple fraction:

217=2+17=2×77+17=2×77+17=147+17=14+17=157 2\frac{1}{7}=2+\frac{1}{7}=2\times\frac{7}{7}+\frac{1}{7}=\frac{2\times7}{7}+\frac{1}{7}=\frac{14}{7}+\frac{1}{7}=\frac{14+1}{7}=\frac{15}{7}

Now the exercise we have is:

157:14= \frac{15}{7}:\frac{1}{4}=

next we convert the division exercise into a multiplication exercise, remembering to switch the numerator and denominator in the second fraction:

157×41= \frac{15}{7}\times\frac{4}{1}=

Let's now combine into one multiplication exercise:

15×47×1=607 \frac{15\times4}{7\times1}=\frac{60}{7}

Next, we factor 60 into an addition exercise:

56+47= \frac{56+4}{7}=

Then let's separate the exercise into addition between fractions:

567+47= \frac{56}{7}+\frac{4}{7}=

Finally, we solve the first fraction exercise to get our answer:

8+47=847 8+\frac{4}{7}=8\frac{4}{7}

3

Final Answer

847 8\frac{4}{7}

Key Points to Remember

Essential concepts to master this topic
  • Conversion: Change mixed numbers to improper fractions first
  • Technique: Division by 1/4 becomes multiplication by 4/1
  • Check: Convert final answer back to mixed number form ✓

Common Mistakes

Avoid these frequent errors
  • Dividing the whole number and fraction parts separately
    Don't divide 2 ÷ 1/4 = 8, then 1/7 ÷ 1/4 = 4/7 separately! This ignores how mixed numbers work as single values. Always convert the entire mixed number to an improper fraction first, then divide.

Practice Quiz

Test your knowledge with interactive questions

a is negative number.

b is negative number.

What is the sum of a+b?

FAQ

Everything you need to know about this question

Why do I need to convert the mixed number to an improper fraction?

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A mixed number like 217 2\frac{1}{7} represents one single value, not separate parts. Converting to 157 \frac{15}{7} lets you work with it as one fraction in division.

How do I remember to flip the second fraction?

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Think: "Division by a fraction means multiply by its reciprocal." So ÷14 ÷\frac{1}{4} becomes ×41 ×\frac{4}{1} . Flip the numerator and denominator!

What's the fastest way to convert a mixed number?

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Use the formula: Multiply whole number by denominator, add numerator, keep same denominator. For 217 2\frac{1}{7} : (2×7)+1 = 15, so 157 \frac{15}{7} .

How do I convert the improper fraction back to a mixed number?

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Divide the numerator by denominator. For 607 \frac{60}{7} : 60÷7 = 8 remainder 4, so 847 8\frac{4}{7} .

Can I check my answer by multiplying back?

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Yes! Multiply your answer by the divisor: 847×14 8\frac{4}{7} × \frac{1}{4} should equal 217 2\frac{1}{7} . This confirms your division is correct.

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