Calculate the Product: Adding 1/3 and 5/12, Then Multiply by 24

Distributive Property with Mixed Number Fractions

(13+512)×24= (\frac{1}{3}+\frac{5}{12})\times24=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Make sure to multiply the outer factor by each factor in parentheses
00:21 Solve each multiplication separately and then sum up
00:31 Break down 24 into factors 12 and 2
00:34 Calculate 24 divided by 3
00:37 Reduce what we can
00:44 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

(13+512)×24= (\frac{1}{3}+\frac{5}{12})\times24=

2

Step-by-step solution

We'll use the distributive property and multiply 24 by each term in parentheses:

(13×24)+(512×24)= (\frac{1}{3}\times24)+(\frac{5}{12}\times24)=

Let's solve the left parentheses. Remember that:

24=241 24=\frac{24}{1}

13×241=1×243×1=243 \frac{1}{3}\times\frac{24}{1}=\frac{1\times24}{3\times1}=\frac{24}{3}

Now let's look at the right parentheses, where we'll split 24 into a smaller multiplication exercise that will help us later with reduction:

(512×24)=(512×12×2) (\frac{5}{12}\times24)=(\frac{5}{12}\times12\times2)

Now we'll reduce the 12 in the numerator and the 12 in the multiplication exercise and get:

243+5×2= \frac{24}{3}+5\times2=

Let's solve the fraction:

243=8 \frac{24}{3}=8

Now we'll get the exercise:

8+(5×2)= 8+(5\times2)=

According to the order of operations, we'll solve what's in the parentheses and get:

8+10=18 8+10=18

3

Final Answer

18 18

Key Points to Remember

Essential concepts to master this topic
  • Order: Add fractions first, then multiply by whole number
  • Technique: Use distributive property: 24×13+24×512=8+10 24 \times \frac{1}{3} + 24 \times \frac{5}{12} = 8 + 10
  • Check: Verify 912×24=34×24=18 \frac{9}{12} \times 24 = \frac{3}{4} \times 24 = 18

Common Mistakes

Avoid these frequent errors
  • Adding fractions incorrectly without common denominator
    Don't add 13+512=615 \frac{1}{3} + \frac{5}{12} = \frac{6}{15} by adding numerators and denominators separately = wrong sum! This ignores that fractions need the same denominator to add. Always find the LCD (12) first: 412+512=912 \frac{4}{12} + \frac{5}{12} = \frac{9}{12} .

Practice Quiz

Test your knowledge with interactive questions

\( \frac{2}{4}+\frac{1}{4}= \)\( \)

FAQ

Everything you need to know about this question

Should I add the fractions first or use the distributive property?

+

Both methods work! Adding first: 13+512=912 \frac{1}{3} + \frac{5}{12} = \frac{9}{12} , then multiply by 24. Distributive property: 24×13+24×512 24 \times \frac{1}{3} + 24 \times \frac{5}{12} . The distributive property is often easier!

How do I find the common denominator for 1/3 and 5/12?

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Look for the LCD (Least Common Denominator). Since 12 is a multiple of 3 (12 = 3 × 4), the LCD is 12. Convert: 13=412 \frac{1}{3} = \frac{4}{12} .

Why does 24 × 1/3 equal 8?

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When multiplying a whole number by a fraction: 24×13=243=8 24 \times \frac{1}{3} = \frac{24}{3} = 8 . Think of it as dividing 24 into 3 equal parts and taking 1 part!

What's the shortcut for 5/12 × 24?

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Notice that 24 = 12 × 2, so: 512×24=512×12×2=5×2=10 \frac{5}{12} \times 24 = \frac{5}{12} \times 12 \times 2 = 5 \times 2 = 10 . The 12s cancel out!

How can I check my answer of 18?

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Substitute back: 912×24=34×24 \frac{9}{12} \times 24 = \frac{3}{4} \times 24 . Since 34 \frac{3}{4} of 24 is 18, your answer is correct! ✓

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