Solve (1/3 + 9/11) × 33: Mixed Fraction Operations

Distributive Property with Fraction Multiplication

(13+911)×33= (\frac{1}{3}+\frac{9}{11})\times33=

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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 external factor with each term in parentheses
00:26 Factor 33 into factors 11 and 3
00:32 Divide 33 by 3
00:35 Simplify what we can
00:43 Always solve multiplication and division before addition and subtraction
00:50 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+911)×33= (\frac{1}{3}+\frac{9}{11})\times33=

2

Step-by-step solution

We'll use the distributive property and multiply 33 by each term in the parentheses:

(13×33)+(91×33)= (\frac{1}{3}\times33)+(\frac{9}{1}\times33)=

Let's solve the left parentheses. Remember that:

33=331 33=\frac{33}{1}

13×331=1×333×1=333 \frac{1}{3}\times\frac{33}{1}=\frac{1\times33}{3\times1}=\frac{33}{3}

Now let's address the right parentheses, where we'll break down 33 into a smaller multiplication exercise that will help us later with reduction:

(911×33)=(911×11×3) (\frac{9}{11}\times33)=(\frac{9}{11}\times11\times3)

Now we'll reduce the 11 in the numerator and the 11 in the multiplication exercise and get:

333+9×3= \frac{33}{3}+9\times3=

Let's solve the fraction:

333=11 \frac{33}{3}=11

Now we'll get the exercise:

11+(9×3)= 11+(9\times3)=

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

11+27=38 11+27=38

3

Final Answer

38 38

Key Points to Remember

Essential concepts to master this topic
  • Distributive Property: Multiply each term inside parentheses by the outside number
  • Technique: 13×33=333=11 \frac{1}{3} \times 33 = \frac{33}{3} = 11 and 911×33=27 \frac{9}{11} \times 33 = 27
  • Check: Verify by computing 13+911=3833 \frac{1}{3} + \frac{9}{11} = \frac{38}{33} , then 3833×33=38 \frac{38}{33} \times 33 = 38

Common Mistakes

Avoid these frequent errors
  • Adding fractions before applying distributive property
    Don't find a common denominator for 13+911 \frac{1}{3} + \frac{9}{11} first = creates complex fractions like 3833 \frac{38}{33} ! This makes multiplication much harder and increases chances of errors. Always use the distributive property first to multiply each fraction separately by 33.

Practice Quiz

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FAQ

Everything you need to know about this question

Why use distributive property instead of adding the fractions first?

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Using the distributive property makes the math much easier! When you multiply each fraction by 33 separately, you often get whole numbers that are simple to add together.

How do I multiply a fraction by a whole number?

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Multiply the numerator by the whole number and keep the denominator the same. For example: 13×33=1×333=333=11 \frac{1}{3} \times 33 = \frac{1 \times 33}{3} = \frac{33}{3} = 11

What if the fraction doesn't simplify to a whole number?

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That's okay! Just leave it as a simplified fraction and add it to the other terms. The final answer might be a mixed number or improper fraction.

Can I factor out common numbers to make this easier?

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Absolutely! Notice that 33 = 3 × 11, so 911×33=911×11×3=9×3=27 \frac{9}{11} \times 33 = \frac{9}{11} \times 11 \times 3 = 9 \times 3 = 27 after the 11s cancel out!

How do I check my answer is correct?

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You can work backwards: if your answer is 38, then 38÷33 38 \div 33 should equal 13+911 \frac{1}{3} + \frac{9}{11} . Or substitute specific values to verify your distributive property work!

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