If the length of a side of a cube is doubled, how does the volume change?

Practice Questions

Q1
If the length of a side of a cube is doubled, how does the volume change?
  1. Increases by 2 times
  2. Increases by 4 times
  3. Increases by 8 times
  4. Remains the same

Questions & Step-by-Step Solutions

If the length of a side of a cube is doubled, how does the volume change?
  • Step 1: Understand that a cube has sides of equal length. Let's call the length of one side 'a'.
  • Step 2: The formula for the volume of a cube is V = a³, which means you multiply the length of the side by itself three times.
  • Step 3: If we double the length of the side, the new length becomes 2a.
  • Step 4: Now, we need to find the new volume using the new side length. The new volume is V = (2a)³.
  • Step 5: Calculate (2a)³. This means (2a) * (2a) * (2a).
  • Step 6: When you multiply it out, you get 2 * 2 * 2 * a * a * a = 8a³.
  • Step 7: Compare the new volume (8a³) to the original volume (a³).
  • Step 8: Since 8a³ is 8 times a³, we conclude that the volume increases by 8 times.
  • Volume of a Cube – Understanding the formula for the volume of a cube (V = a³) and how changes in the side length affect the volume.
  • Exponential Growth – Recognizing that doubling a linear dimension results in an exponential increase in volume.
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