Divide Mixed Numbers: (±3 3/13) ÷ (±1 12/13) Step-by-Step Solution

Mixed Number Division with Sign Rules

(±3313):(±11213)= ? (\pm3\frac{3}{13}):(\pm1\frac{12}{13})=\text{ ?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:05 Positive divided by positive is always positive
00:30 Convert mixed numbers to fractions
00:47 Write division as multiplication by reciprocal
00:53 Switch between numerator and denominator
00:57 Reduce what is possible
01:03 Break down the fraction into whole number and remainder
01:08 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

(±3313):(±11213)= ? (\pm3\frac{3}{13}):(\pm1\frac{12}{13})=\text{ ?}

2

Step-by-step solution

Since we are dividing two positive numbers, the result must be a positive number:

+:+=+ +:+=+

First, we'll convert each mixed fraction into an improper fraction as follows:

3313=3×13+313=39+313=4213 3\frac{3}{13}=\frac{3\times13+3}{13}=\frac{39+3}{13}=\frac{42}{13}

11213=1×13+1213=13+1213=2513 1\frac{12}{13}=\frac{1\times13+12}{13}=\frac{13+12}{13}=\frac{25}{13}

Now we have:

4213:2513 \frac{42}{13}:\frac{25}{13}

We'll convert the division problem into multiplication, remembering to switch the numerator and denominator:

4213×1325= \frac{42}{13}\times\frac{13}{25}=

We'll simplify the 13 to get:

4225= \frac{42}{25}=

Now we'll factor 42 into an addition problem:

25+1725=2525+1725= \frac{25+17}{25}=\frac{25}{25}+\frac{17}{25}=

Finally, we will solve accordingly to get:

1+1725=11725 1+\frac{17}{25}=1\frac{17}{25}

3

Final Answer

11725 1\frac{17}{25}

Key Points to Remember

Essential concepts to master this topic
  • Sign Rule: Positive divided by positive equals positive result
  • Technique: Convert 3313 3\frac{3}{13} to 4213 \frac{42}{13} before dividing
  • Check: Multiply answer by divisor: 11725×11213=3313 1\frac{17}{25} \times 1\frac{12}{13} = 3\frac{3}{13}

Common Mistakes

Avoid these frequent errors
  • Forgetting to flip the divisor when converting division to multiplication
    Don't just multiply 4213×2513=1050169 \frac{42}{13} \times \frac{25}{13} = \frac{1050}{169} ! This gives a huge incorrect answer. Always flip the second fraction when dividing: 4213×1325 \frac{42}{13} \times \frac{13}{25} .

Practice Quiz

Test your knowledge with interactive questions

Solve the following exercise:

\( (+6)\cdot(+9)= \)

FAQ

Everything you need to know about this question

Why do both numbers have ± signs in the problem?

+

The ± symbols mean the numbers could be positive or negative. Since the explanation shows positive division, we're working with positive values: +3313÷+11213 +3\frac{3}{13} ÷ +1\frac{12}{13} .

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

+

Use the formula: whole × denominator + numerator over the denominator. For 3313 3\frac{3}{13} : 3×13+313=4213 \frac{3×13+3}{13} = \frac{42}{13} .

Why do we flip the second fraction when dividing?

+

Division by a fraction means multiplying by its reciprocal. Dividing by 2513 \frac{25}{13} is the same as multiplying by 1325 \frac{13}{25} !

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

+

Divide the numerator by denominator: 4225=11725 \frac{42}{25} = 1\frac{17}{25} because 42 ÷ 25 = 1 remainder 17. The remainder becomes the new numerator.

What if the signs were different in the original problem?

+

Use sign rules: positive ÷ negative = negative, and negative ÷ positive = negative. Only positive ÷ positive or negative ÷ negative gives a positive result.

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