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Number theory Difficulty 1.2 Junior Find the answer Canada

The expression $8\times 10^5 + 4\times 10^3 + 9 \times 10 + 5$ is equal to

Pick one

Solution

First, we write out the powers of 10 in full to obtain $8\times 100\,000 + 4\times 1000 + 9\times 10 + 5$ .

Simplifying, we obtain $800\,000 + 4000 + 90 + 5$ or $804\,095$ .

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project.