Difference of Squared Numbers

Many times you will subtract squared numbers so this trick will help make your life easier.

Look at the math problem 542 - 512 = ? .

  • Add the two numbers together..
    • 54 + 51 = 105.
  • Subtract the right number from the left number.
    • 54 - 51 = 3.
  • Multiply these two answers.
    • 105 x 3 = 315.

ANSWER is 315.

Look at the math problem 342 - 212 = ? .

  • Add the two numbers together..
    • 34 + 21 = 55.
  • Subtract the right number from the left number.
    • 34 - 21 = 13.
  • Multiply these two answers.
    • 55 x 13 = 715.

ANSWER is 715.

Watch the math video below for a detailed explanation!

Practice Math Problems

  1. What does 632 - 572 = ?
  2. What does 252 - 212 = ?
  3. What does 722 - 642 = ?
  4. What does 332 - 412 = ?
  5. What does 132 - 232 = ?