Solve: Multiplying 5 by 3⅓ - Step-by-Step Solution

Mixed Number Multiplication with Distributive Property

5×313= 5\times3\frac{1}{3}=

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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 use the distributive law
00:07 Let's break down 3 and one-third into 3 plus one-third
00:11 Multiply the outer term by each term in parentheses
00:15 Calculate each multiplication separately and then sum
00:24 Convert from fraction to whole number and remainder
00:27 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

5×313= 5\times3\frac{1}{3}=

2

Step-by-step solution

We will use the distributive property of multiplication and separate the fraction into an addition exercise between fractions. This allows us to work with smaller numbers and simplify the operation

Reminder - The distributive property of multiplication actually allows us to separate the larger term in the multiplication exercise into a sum or difference of smaller numbers, which makes the multiplication operation easier and gives us the ability to solve the exercise without a calculator

5×(3+13)= 5\times(3+\frac{1}{3})=

We will use the distributive property formula a(b+c)=ab+ac a(b+c)=ab+ac

(5×3)+(5×13)= (5\times3)+(5\times\frac{1}{3})=

Let's solve what's in the left parentheses:

5×3=15 5\times3=15

Let's solve what's in the right parentheses:

5=51 5=\frac{5}{1}

51×13=5×11×3=53 \frac{5}{1}\times\frac{1}{3}=\frac{5\times1}{1\times3}=\frac{5}{3}

And we get the exercise:

15+53=15+123=1623 15+\frac{5}{3}=15+1\frac{2}{3}=16\frac{2}{3}

And now let's see the solution centered:

5×313=5×(3+13)=(5×3)+(5×13)=15+53=15+123=1623 5\times3\frac{1}{3}=5\times(3+\frac{1}{3})=(5\times3)+(5\times\frac{1}{3})=15+\frac{5}{3}=15+1\frac{2}{3}=16\frac{2}{3}

3

Final Answer

1623 16\frac{2}{3}

Key Points to Remember

Essential concepts to master this topic
  • Strategy: Use distributive property to separate mixed numbers into parts
  • Technique: Calculate 5×3 = 15 and 5×⅓ = 5/3 separately
  • Check: Convert final result: 15 + 5/3 = 15 + 1⅔ = 16⅔ ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying only the whole number part
    Don't multiply 5×3 = 15 and ignore the fraction = incomplete answer! This gives you 15 instead of 16⅔, missing 1⅔ completely. Always multiply by both the whole number AND the fractional parts using distributive property.

Practice Quiz

Test your knowledge with interactive questions

\( 6\times\frac{3}{4}= \)

FAQ

Everything you need to know about this question

Why can't I just multiply 5 × 3 and get 15?

+

Because 313 3\frac{1}{3} means 3 + ⅓, not just 3! You need to multiply 5 by the entire mixed number, which includes both the whole number and fraction parts.

What exactly is the distributive property?

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The distributive property says a(b+c)=ab+ac a(b+c) = ab + ac . So 5×313=5×(3+13)=(5×3)+(5×13) 5 \times 3\frac{1}{3} = 5 \times (3 + \frac{1}{3}) = (5 \times 3) + (5 \times \frac{1}{3}) .

How do I multiply 5 × ⅓?

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Convert 5 to a fraction: 51×13=5×11×3=53 \frac{5}{1} \times \frac{1}{3} = \frac{5 \times 1}{1 \times 3} = \frac{5}{3} . Then convert 53 \frac{5}{3} to 123 1\frac{2}{3} .

Why do I get 16⅔ instead of a simpler answer?

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That's the correct answer! When you add 15 + 1⅔, you get 16⅔. Mixed number results are common and perfectly valid in mathematics.

Can I convert the mixed number to an improper fraction first?

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Yes! 313=103 3\frac{1}{3} = \frac{10}{3} , so 5×103=503=1623 5 \times \frac{10}{3} = \frac{50}{3} = 16\frac{2}{3} . Both methods work!

How do I check if 16⅔ is correct?

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Use estimation: 5×313 5 \times 3\frac{1}{3} should be slightly more than 5×3=15 5 \times 3 = 15 . Since 16⅔ > 15, this makes sense! ✓

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