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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

What is the value of $999 \times 999 + 999$ ?

(A) $10\,800$ (B) $100\,800$ (C) $999\,000$ (D) $999\,999$ (E) $1\,000\,998$

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.