Solve: Multiplying 7 × 6/8 - Step-by-Step Solution

Multiplying Integers with Proper Fractions

7×68= 7\times\frac{6}{8}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's move the product to the numerator
00:08 Let's calculate the product
00:11 Now let's convert to a mixed fraction
00:14 Let's break down 42 into 40 plus 2
00:21 Let's separate the fraction into whole number and remainder
00:28 Convert from improper fraction to whole number and combine with mixed fraction
00:35 Let's reduce what we can
00:48 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

7×68= 7\times\frac{6}{8}=

2

Step-by-step solution

To solve the multiplication of an integer with a fraction, we need to follow these steps:

  • Step 1: Multiply the integer 7 by the numerator of the fraction, which is 6.
  • Step 2: Keep 8 as the denominator.
  • Step 3: Simplify the resulting fraction.
  • Step 4: Convert to a mixed number if needed.

Now, let's work through each step:

Step 1: Multiply 7 by 6, which gives us 42 42 as the numerator.

Step 2: The denominator remains 8, so we have the fraction 428\frac{42}{8}.

Step 3: Simplify 428\frac{42}{8} by finding the greatest common divisor (GCD) of 42 and 8. The GCD is 2.

We divide the numerator and the denominator by 2: 42÷28÷2=214\frac{42 \div 2}{8 \div 2} = \frac{21}{4}.

Step 4: Convert 214\frac{21}{4} into a mixed number:

Divide 21 by 4, which equals 5 with a remainder of 1. Thus, 214\frac{21}{4} is equivalent to the mixed number 5145\frac{1}{4}.

Therefore, the solution to the problem is 5145\frac{1}{4}.

3

Final Answer

514 5\frac{1}{4}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply integer by numerator, keep denominator the same
  • Technique: Simplify 428 \frac{42}{8} by dividing both by GCD of 2
  • Check: Convert 214 \frac{21}{4} to mixed number: 21 ÷ 4 = 5 remainder 1 ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying both numerator and denominator by the integer
    Don't multiply 7 × 6 AND 7 × 8 = 4256 \frac{42}{56} ! This changes the fraction's value completely. Always multiply only the numerator by the integer and keep the denominator unchanged.

Practice Quiz

Test your knowledge with interactive questions

\( 5:\frac{2}{5}= \)

FAQ

Everything you need to know about this question

Why don't I multiply the denominator by 7 too?

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When multiplying a fraction by a whole number, you're finding 7 groups of 68 \frac{6}{8} . Think of it as 6+6+6+6+6+6+68=428 \frac{6+6+6+6+6+6+6}{8} = \frac{42}{8} . The denominator stays the same!

How do I know when to convert to a mixed number?

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Convert to a mixed number when the numerator is larger than the denominator (improper fraction). Since 21 > 4, we write 214 \frac{21}{4} as 514 5\frac{1}{4} .

What if I can't find the GCD easily?

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Start by checking if both numbers are even (divisible by 2). For 42 and 8, both are even, so divide by 2. Keep dividing by common factors until you can't anymore.

Can I leave my answer as an improper fraction?

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Yes! 214 \frac{21}{4} and 514 5\frac{1}{4} are equivalent. However, mixed numbers are often preferred because they're easier to visualize and compare.

What if the original fraction can be simplified first?

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You can simplify before or after multiplying! 68=34 \frac{6}{8} = \frac{3}{4} , so 7×34=214 7 \times \frac{3}{4} = \frac{21}{4} . Both methods give the same result.

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