SAT Math Question of the Day

Math Category: Roots Level 2:

Q: 1 / √ 2

  1. √ 2  / 2
  2. √ 2
  3. 1/2
  4. 2
  5. 1/4

UNANSWERED.

The correct answer is A.

A: The answer is √ 2  / 2.

If you have a root in the bottom half of the fraction (the denominator) you have to multiply the top and bottom parts of the fraction by the root.

1   =   1 × √ 2   =   √ 2
√ 2 √ 2 × √ 2 2

The math term for this is to "rationalize the denominator".