Solve: 2/3 Divided by 1¾ - Mixed Number Division

Fraction Division with Mixed Numbers

23:134= \frac{2}{3}:1\frac{3}{4}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Convert mixed number to fraction
00:08 Calculate the numerator and substitute back into the exercise
00:21 Convert division to multiplication by reciprocal
00:35 Make sure to multiply numerator by numerator and denominator by denominator
00:40 Calculate the products
00:44 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

23:134= \frac{2}{3}:1\frac{3}{4}=

2

Step-by-step solution

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

  • Step 1: Convert the mixed number 1341\frac{3}{4} to an improper fraction.

  • Step 2: Replace the division with multiplication by the reciprocal of the improper fraction.

  • Step 3: Perform the multiplication and simplify if necessary.

Now, let's work through each step:
Step 1: Convert 1341\frac{3}{4} to an improper fraction.
A mixed number abca \frac{b}{c} is converted to an improper fraction ac+bc\frac{ac + b}{c}.
So, 134=1×4+34=741\frac{3}{4} = \frac{1 \times 4 + 3}{4} = \frac{7}{4}.

Step 2: Replace the division with multiplication by the reciprocal of 74\frac{7}{4}.
The reciprocal of 74\frac{7}{4} is 47\frac{4}{7}, so the expression becomes: 23×47\frac{2}{3} \times \frac{4}{7}.

Step 3: Perform the multiplication:
Multiply the numerators: 2×4=82 \times 4 = 8.
Multiply the denominators: 3×7=213 \times 7 = 21.
Thus, the product is 821\frac{8}{21}.

No further simplification is needed as 8 and 21 have no common factors.

Therefore, the solution to the problem is 821 \frac{8}{21} .

3

Final Answer

821 \frac{8}{21}

Key Points to Remember

Essential concepts to master this topic
  • Convert: Change mixed numbers to improper fractions first
  • Technique: Replace division with multiplication by reciprocal: 23×47 \frac{2}{3} \times \frac{4}{7}
  • Check: Verify 8 and 21 share no common factors for simplest form ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to convert mixed numbers to improper fractions
    Don't try to divide by 134 1\frac{3}{4} directly = confusion and wrong answers! You can't apply division rules to mixed numbers. Always convert mixed numbers to improper fractions first, then use the reciprocal method.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{1}{2}:3= \)\( \)\( \)\( \)

FAQ

Everything you need to know about this question

Why do I need to convert the mixed number first?

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You can't divide by a mixed number directly! Converting 134 1\frac{3}{4} to 74 \frac{7}{4} gives you a proper fraction that you can flip to find the reciprocal.

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

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Use the formula: abc=a×c+bc a\frac{b}{c} = \frac{a \times c + b}{c} . For 134 1\frac{3}{4} : multiply 1 × 4 = 4, add 3 = 7, keep denominator 4, so 74 \frac{7}{4} .

What's the reciprocal and why do I need it?

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The reciprocal flips a fraction: 74 \frac{7}{4} becomes 47 \frac{4}{7} . Division by a fraction equals multiplication by its reciprocal - this is the key rule for fraction division!

Do I always need to simplify my answer?

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Yes! Always check if your numerator and denominator share common factors. Since 8 and 21 share no common factors, 821 \frac{8}{21} is already in simplest form.

Can I use decimals instead of fractions?

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You could convert to decimals, but fractions give you the exact answer. 821 \frac{8}{21} is more precise than the decimal approximation 0.381...

What if I get confused about which fraction to flip?

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Always flip the second fraction (the one you're dividing by). In 23÷74 \frac{2}{3} ÷ \frac{7}{4} , flip 74 \frac{7}{4} to get 47 \frac{4}{7} , then multiply.

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