Because OCR is teaching you that phone manufacturers, architects, and engineers love irrational numbers. Without surds, your screen would be a square. OCR is the exam board that admits maths is rarely a "nice, round number."
They know that √2 is exactly 1.41421356... but they keep it as √2 just to be safe.
Good luck. And don't forget to show your working – OCR reads every line, not just the answer box.
Here is the most interesting fact of all. In the real world, an engineer who gets 100% on an AQA paper might build a bridge that collapses because they rounded pi. An engineer who scrapes a pass on OCR?
Here is the OCR secret: They don't actually care about the number. Edexcel often asks for "3.14". OCR asks for "in terms of π" or "as a simplified surd."
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