Solve: 1/4 × 1/3 + 4 × 3/4 - Mixed Fraction Operations

Mixed Operations with Fractions and Integers

14×13+4×34= \frac{1}{4}\times\frac{1}{3}+4\times\frac{3}{4}=

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Step-by-step video solution

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00:00 Multiplication operations precede addition
00:03 Let's start with the left multiplication
00:10 Now let's perform the right multiplication
00:21 Simplify the product

Step-by-step written solution

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1

Understand the problem

14×13+4×34= \frac{1}{4}\times\frac{1}{3}+4\times\frac{3}{4}=

2

Step-by-step solution

According to the rules of the order of arithmetic operations, we must first place the two multiplication exercises inside of the parentheses:

(14×13)+(4×34)= (\frac{1}{4}\times\frac{1}{3})+(4\times\frac{3}{4})=

We then focus on the left parenthesis and combine the multiplication exercise:

(14×13)=1×14×3=112 (\frac{1}{4}\times\frac{1}{3})=\frac{1\times1}{4\times3}=\frac{1}{12}

Next we focus on the right parenthesis and we again combine the multiplication exercise:

(4×34)=4×34=124=3 (4\times\frac{3}{4})=\frac{4\times3}{4}=\frac{12}{4}=3

Finally we obtain the following exercise:

112+3=3112 \frac{1}{12}+3=3\frac{1}{12}

3

Final Answer

3112 3\frac{1}{12}

Key Points to Remember

Essential concepts to master this topic
  • Order of Operations: Complete all multiplication before addition following PEMDAS
  • Technique: Calculate 14×13=112 \frac{1}{4} \times \frac{1}{3} = \frac{1}{12} and 4×34=3 4 \times \frac{3}{4} = 3
  • Check: Final sum 112+3=3112 \frac{1}{12} + 3 = 3\frac{1}{12} matches given answer ✓

Common Mistakes

Avoid these frequent errors
  • Adding before completing multiplication
    Don't try to add 1/4 + 4 first = wrong order! This ignores PEMDAS and gives incorrect results like 17/4 × mixed fractions. Always complete both multiplications first, then add the results.

Practice Quiz

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\( 100+5-100+5 \)

FAQ

Everything you need to know about this question

Why do I multiply first instead of going left to right?

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The order of operations (PEMDAS) tells us to do multiplication and division before addition and subtraction. This rule ensures everyone gets the same answer every time!

How do I multiply a whole number by a fraction?

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Write the whole number as a fraction! For example: 4×34=41×34=124=3 4 \times \frac{3}{4} = \frac{4}{1} \times \frac{3}{4} = \frac{12}{4} = 3

What if I get different denominators to add?

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You need a common denominator! Convert the whole number to a fraction with the same denominator: 3=3612 3 = \frac{36}{12} , then add: 112+3612=3712 \frac{1}{12} + \frac{36}{12} = \frac{37}{12}

How do I convert an improper fraction to mixed number?

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Divide the numerator by denominator! 3712=37÷12=3 \frac{37}{12} = 37 ÷ 12 = 3 remainder 1 1 , so the answer is 3112 3\frac{1}{12}

Can I use a calculator for fraction multiplication?

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It's better to learn the method first! Multiply numerators together, multiply denominators together, then simplify. This builds your number sense for more complex problems.

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