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Simplification & Approximation · Question 60 of 71

Question 60

EasyOriginal question

What is 624.8+14.93\sqrt{624.8} + 14.93 approximately equal to?

Options for question 60

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. 624.8624.8 is very close to 625=252625 = 25^2, so 624.8≈25\sqrt{624.8} \approx 25.

  2. 14.93≈1514.93 \approx 15, so the total is about 25+15=4025 + 15 = 40.

Worth noting

Look for the nearest perfect square under the root. 25 is only the square root; the 14.93 still has to be added.

Concept
Estimating a square root with the nearest perfect square
Typical time
35 s
Your time
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The rule this testsApproximation
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Ten questions from Simplification & Approximation, at your own pace.

Practise this chapter →

Ten questions from Simplification & Approximation, at your own pace.