Online GMAT Math problems. Задачи от репетитора по математике на английском онлайн

Online GMAT Maths problems.
Задачи от репетитора по математике на английском онлайн

The square root of 61504 is exactly

(A) 245 (B) 246 (C) 247 (D) 248 (E) 249

Советы опытного репетитора - учителя математики на английском - Math Teacher Online

Finding Square Roots

To find the number of digits in the square root of a number, remember that the first step in the procedure for finding a square root is to pair off the numbers in the radical sign on either side of the decimal point.
Every pair of numbers under the radical gives one number in the answer.

If you are given several choices for the square root of, say, 321489, look first for a three-digit number.

If there is only one among the answers, that is the one you should select.
If there is more than one, you will have to reason further.
If a number ends in 9, such as in the example, its square root would have to end in a digit that would end in 9 when multiplied by itself.
This might be either 3 or 7.
Only one of these would probably be among the choices, as very few GMAT problems call for much computation.
The only answer among the choices that will end in 4 when squared is (D).

How I studied for the GMAT Test - Все видеоролики репетитора Султанова А.Э.

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