Verify if (5×3-4×2)/(2×4-3×5) = 0: Fraction Simplification Check

Fraction Evaluation with Negative Results

Determine if the simplification below is correct:

53422435=0 \frac{5\cdot3-4\cdot2}{2\cdot4-3\cdot5}=0

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine if the reduction is correct
00:06 Calculate the products
00:25 Calculate the differences
00:31 Reduce what is possible
00:38 Compare the expressions
00:42 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

Determine if the simplification below is correct:

53422435=0 \frac{5\cdot3-4\cdot2}{2\cdot4-3\cdot5}=0

2

Step-by-step solution

To determine if the given mathematical simplification is correct, we must evaluate both the numerator and the denominator separately and then divide the results. Let's work through this step by step.

The expression we are examining is:

53422435 \frac{5\cdot3-4\cdot2}{2\cdot4-3\cdot5}

First, let's calculate the numerator:

  • Calculate 53=155 \cdot 3 = 15.
  • Calculate 42=84 \cdot 2 = 8.
  • Subtract these results: 158=715 - 8 = 7.

The numerator simplifies to 77.

Next, we calculate the denominator:

  • Calculate 24=82 \cdot 4 = 8.
  • Calculate 35=153 \cdot 5 = 15.
  • Subtract these results: 815=78 - 15 = -7.

The denominator simplifies to 7-7.

Now, we perform the division:

77=1 \frac{7}{-7} = -1

Thus, the value of the original expression is 1-1, not 00, as stated in the problem.

Therefore, the statement that the original expression simplifies to 00 is false.

Hence, the correct answer to this problem is False.

3

Final Answer

False

Key Points to Remember

Essential concepts to master this topic
  • Order of Operations: Calculate multiplications first, then subtract within each part
  • Technique: Numerator: 5×3-4×2 = 15-8 = 7, Denominator: 2×4-3×5 = 8-15 = -7
  • Check: Final division 7÷(-7) = -1, not 0 as claimed ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting order of operations in complex fractions
    Don't calculate from left to right ignoring multiplication first = wrong intermediate values! This leads to incorrect numerator and denominator calculations. Always multiply first, then subtract within each part of the fraction.

Practice Quiz

Test your knowledge with interactive questions

Determine if the simplification shown below is correct:

\( \frac{7}{7\cdot8}=8 \)

FAQ

Everything you need to know about this question

Why is the denominator negative when I subtract?

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When you calculate 2×43×5=815 2 \times 4 - 3 \times 5 = 8 - 15 , you're subtracting a larger number from a smaller one, which always gives a negative result. This is perfectly normal in math!

How do I know if a fraction equals zero?

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A fraction equals zero only when the numerator is zero and the denominator is not zero. Since our numerator is 7 (not 0), this fraction cannot equal zero.

What does it mean when I divide a positive by a negative?

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Dividing a positive number by a negative number always gives a negative result. So 77=1 \frac{7}{-7} = -1 , not zero.

Should I simplify fractions before checking if they equal zero?

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Yes, always simplify first! In this case, 77 \frac{7}{-7} simplifies to 1 -1 , making it clear the answer is not zero.

Can I use a calculator for this type of problem?

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Calculators are helpful, but make sure you use parentheses correctly! Enter it as (5×3-4×2)÷(2×4-3×5) to get the right answer of -1.

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