# 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 54^{2} - 51^{2} = ? .

- 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 34^{2} - 21^{2} = ? .

- 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

- What does 63
^{2}- 57^{2}= ? - What does 25
^{2}- 21^{2}= ? - What does 72
^{2}- 64^{2}= ? - What does 33
^{2}- 41^{2}= ? - What does 13
^{2}- 23^{2}= ?