Solve: (3/4 × 3/4) - 1/4 Fraction Operation Problem

Fraction Operations with Mixed Arithmetic

34×3414= \frac{3}{4}\times\frac{3}{4}-\frac{1}{4}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's solve this problem step-by-step!
00:09 First, multiply the top numbers together for the new numerator, and the bottom numbers for the new denominator.
00:17 Now, calculate these multiplications carefully.
00:21 Next, multiply the fraction by four. This helps us find a common denominator.
00:26 Remember to multiply both the top and bottom numbers by four.
00:37 Now, calculate these new multiplications.
00:42 Then, subtract using the common denominator.
00:51 Work out the top number to find the answer.
00:55 And that's how we solve this question! Great job.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

34×3414= \frac{3}{4}\times\frac{3}{4}-\frac{1}{4}=

2

Step-by-step solution

To solve this mathematical problem, follow these steps:

  • Step 1: Multiply the fractions 34\frac{3}{4} and 34\frac{3}{4}.
  • Step 2: Subtract 14\frac{1}{4} from the product obtained in Step 1.

Let's execute each step in detail:

Step 1: Calculate the product of 34\frac{3}{4} and 34\frac{3}{4}.

To multiply two fractions, multiply their numerators and their denominators separately:

34×34=3×34×4=916 \frac{3}{4} \times \frac{3}{4} = \frac{3 \times 3}{4 \times 4} = \frac{9}{16}

Step 2: Subtract 14\frac{1}{4} from 916\frac{9}{16}.

Before we subtract 14\frac{1}{4} from 916\frac{9}{16}, we need a common denominator. The common denominator for these fractions is 16:

14=1×44×4=416 \frac{1}{4} = \frac{1 \times 4}{4 \times 4} = \frac{4}{16}

Now subtract 416\frac{4}{16} from 916\frac{9}{16}:

916416=9416=516 \frac{9}{16} - \frac{4}{16} = \frac{9 - 4}{16} = \frac{5}{16}

Therefore, the solution to the given problem is 516 \frac{5}{16} .

3

Final Answer

516 \frac{5}{16}

Key Points to Remember

Essential concepts to master this topic
  • Order: Multiply fractions first, then subtract using common denominators
  • Technique: Convert 14 \frac{1}{4} to 416 \frac{4}{16} for subtraction
  • Check: Verify 916416=516 \frac{9}{16} - \frac{4}{16} = \frac{5}{16} by adding back ✓

Common Mistakes

Avoid these frequent errors
  • Adding denominators when multiplying fractions
    Don't multiply 34×34 \frac{3}{4} \times \frac{3}{4} as 68 \frac{6}{8} by adding denominators! This gives wrong results because multiplication requires multiplying numerators together AND denominators together. Always multiply straight across: 3×34×4=916 \frac{3 \times 3}{4 \times 4} = \frac{9}{16} .

Practice Quiz

Test your knowledge with interactive questions

\( \frac{1}{3}+\frac{1}{4}= \)

FAQ

Everything you need to know about this question

Why do I need to find a common denominator for subtraction but not multiplication?

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When multiplying fractions, you multiply straight across - no common denominator needed! But for addition or subtraction, fractions must have the same denominator to combine properly.

How do I know what the common denominator should be?

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Find the least common multiple (LCM) of the denominators. In this problem, we need the LCM of 16 and 4, which is 16 since 4 goes into 16 evenly.

Can I simplify 516 \frac{5}{16} further?

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No, 516 \frac{5}{16} is already in lowest terms because 5 and 16 share no common factors other than 1. Always check if your final answer can be simplified!

What if I get confused about the order of operations?

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Remember PEMDAS! Multiplication comes before subtraction, so calculate 34×34 \frac{3}{4} \times \frac{3}{4} first, then subtract 14 \frac{1}{4} from that result.

Why can't I just work from left to right?

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Math has specific rules called order of operations. If you subtract first, you'd get 3414=24 \frac{3}{4} - \frac{1}{4} = \frac{2}{4} , then multiply to get 616 \frac{6}{16} - which is wrong!

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