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What is the least positive number to be added to or subtracted from 700 to make it a perfect square?

1. 29
2. 30
3. 24
4. 26

Correct answer: 24

Solution

The nearest perfect squares around 700 are 26^2 = 676 and 27^2 = 729. The smaller difference is 700 - 676 = 24, so 24 is the least number to be subtracted or added to make 700 a perfect square.

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