Math Problem Statement

Pick any number, multiply the number by 4, add 2 to the product, divide the sum by 2, and subtract 1 from the quotient. What is the correct conjecture about the relationship between the original number and the final number?

Solution

The question asks for a conjecture based on a sequence of operations applied to any chosen number.

Let’s break down the process:

  1. Pick any number: Let the number be denoted as xx.
  2. Multiply the number by 4: This gives 4x4x.
  3. Add 2 to the product: This gives 4x+24x + 2.
  4. Divide the sum by 2: This gives 4x+22\frac{4x + 2}{2}, which simplifies to 2x+12x + 1.
  5. Subtract 1 from the quotient: This gives 2x+11=2x2x + 1 - 1 = 2x.

Thus, the final result after applying all the operations is twice the original number.

Correct answer:

  • The number you end with will always be twice the original number.

This corresponds to the second option: "The number you end with will always be twice the original number."


Would you like a deeper explanation of how we derived this result? Here are some related questions for further exploration:

  1. What happens if the initial number is negative?
  2. Can we reverse the process to find the original number from the final result?
  3. What if a different operation was applied at each step, such as adding 3 instead of 2?
  4. How does this process change if we multiply by 3 instead of 4 in the first step?
  5. Can you find a pattern if you apply a similar process with other arithmetic operations?

Tip: When breaking down complex problems, try to solve step by step, checking your work as you go along.

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Math Problem Analysis

Mathematical Concepts

Algebra
Arithmetic Operations

Formulas

4x (Multiply by 4)
(4x + 2) (Add 2 to the product)
(4x + 2) / 2 (Divide by 2)
(2x + 1 - 1 = 2x) (Final result is twice the original number)

Theorems

Linear Arithmetic Conjecture

Suitable Grade Level

Grades 5-8