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

What will be the sign of the result of the next exercise?

\( (-2)\cdot(-4)= \)

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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