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Number theory Difficulty 1.0 Junior Find the answer United Kingdom

When $4^5 \times 5^4$ is correctly calculated, how many digits are there in the answer?

(A) $4$ (B) $6$ (C) $10$ (D) $16$ (E) $20$

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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.