Solve: Multiplying 7 by 2/5 Step-by-Step

Whole Number and Fraction Multiplication

7×25= 7\times\frac{2}{5}=

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's move the multiplier to the numerator
00:07 Let's calculate the multiplication
00:11 Now let's convert to a mixed fraction
00:15 Let's break down 14 into 10 plus 4
00:21 Let's break down the fraction into a whole number and remainder
00:27 Let's convert from an improper fraction to a whole number, and combine into a mixed fraction
00:33 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

7×25= 7\times\frac{2}{5}=

2

Step-by-step solution

To solve the problem 7×25 7 \times \frac{2}{5} , we will follow a structured approach:

  • Step 1: Multiply the whole number by the numerator of the fraction.
  • Step 2: Retain the denominator of the fraction.
  • Step 3: Simplify the resulting fraction, if possible.

Let's work through each step:

Step 1: Multiply the whole number by the numerator.
We have 7×2=14 7 \times 2 = 14 .

Step 2: Keep the denominator the same.
The resulting fraction is 145\frac{14}{5}.

Step 3: Convert the improper fraction to a mixed number if possible.
Divide the numerator by the denominator: 14÷5=2 14 \div 5 = 2 with a remainder of 4 4 .
This results in the mixed number 245 2\frac{4}{5} .

Therefore, the solution to the problem 7×25 7 \times \frac{2}{5} is 245 2\frac{4}{5} , which corresponds to choice 3 in the provided options.

3

Final Answer

245 2\frac{4}{5}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply whole number by numerator, keep denominator unchanged
  • Technique: Convert improper fraction 145 \frac{14}{5} to mixed number 245 2\frac{4}{5}
  • Check: Verify 245=145 2\frac{4}{5} = \frac{14}{5} by converting back to improper fraction ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying both numerator and denominator by the whole number
    Don't multiply 7 × 2/5 as (7×2)/(7×5) = 14/35! This changes the fraction's value completely. Always multiply only the numerator by the whole number and keep the denominator the same.

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?

+

When multiplying a whole number by a fraction, you're finding 7 groups of 2/5. The denominator tells you the size of each piece, which stays the same. Only the number of pieces (numerator) changes!

Do I have to convert to a mixed number?

+

Not always! Both 145 \frac{14}{5} and 245 2\frac{4}{5} are correct answers. However, mixed numbers are often preferred because they're easier to understand and compare.

How do I know when to convert an improper fraction?

+

Convert when the numerator is larger than the denominator. Divide the numerator by denominator: the quotient becomes the whole number, and the remainder becomes the new numerator.

What if the remainder is zero when converting?

+

Great! That means your answer is a whole number. For example, 155=3 \frac{15}{5} = 3 with no fractional part.

Can I simplify before multiplying?

+

Yes! If the whole number and denominator share common factors, you can simplify first. For example, with 6×23 6 \times \frac{2}{3} , divide both 6 and 3 by 3 first.

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Mixed Fractions questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations