Multiply 7/8 by a Factor of 7: Fraction Scaling Problem

Fraction Multiplication with Scaling Factors

Increase the following fraction by a factor of 7:

78= \frac{7}{8}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Expand the fraction by 7
00:03 Multiply the fraction by the given factor
00:07 Make sure to multiply both numerator and denominator
00:10 Calculate the multiplications
00:14 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

Increase the following fraction by a factor of 7:

78= \frac{7}{8}=

2

Step-by-step solution

Let's multiply both the numerator and denominator by 7 as follows:

7×78×7=4956 \frac{7\times7}{8\times7}=\frac{49}{56}

3

Final Answer

4956 \frac{49}{56}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply both numerator and denominator by the same factor
  • Technique: 7/8 × 7 means (7×7)/(8×7) = 49/56
  • Check: Verify 49/56 = 7 × 7/8 by reducing back ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying only the numerator by the factor
    Don't multiply just 7 by 7 to get 49/8 = wrong answer! This changes the fraction's value instead of scaling it. Always multiply both numerator AND denominator by the same factor.

Practice Quiz

Test your knowledge with interactive questions

Without calculating, determine whether the quotient in the division exercise is less than 1 or not:

\( 5:6= \)

FAQ

Everything you need to know about this question

What does 'increase by a factor of 7' actually mean?

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Increasing by a factor of 7 means multiplying the entire fraction by 7. Think of it as making the fraction 7 times bigger while keeping it equivalent to 7×78 7 \times \frac{7}{8} .

Why do I multiply both top and bottom by 7?

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When you multiply both numerator and denominator by the same number, you create an equivalent fraction. This is like saying 78=7×78×7 \frac{7}{8} = \frac{7 \times 7}{8 \times 7} - they have the same value!

How is 49/56 the same as 7 times 7/8?

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4956 \frac{49}{56} represents 7×78 7 \times \frac{7}{8} written as a single fraction. You can verify: 7×78=7×78=498 7 \times \frac{7}{8} = \frac{7 \times 7}{8} = \frac{49}{8} , but we write it with denominator 56 to show the scaling clearly.

Can I simplify 49/56 to a smaller fraction?

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Yes! 4956=7×77×8=78 \frac{49}{56} = \frac{7 \times 7}{7 \times 8} = \frac{7}{8} . But the question asks for the result after scaling, so 4956 \frac{49}{56} shows the multiplication work clearly.

What if the factor was a different number like 3?

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Same process! For factor 3: 7×38×3=2124 \frac{7 \times 3}{8 \times 3} = \frac{21}{24} . Always multiply both numerator and denominator by the scaling factor.

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