To compare the two numbers \( 6.25 \times 10^9 \) and \( 8.45 \times 10^5 \), we can express both in standard form:
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Convert \( 8.45 \times 10^5 \) to the same power of ten as \( 6.25 \times 10^9 \):
- \( 8.45 \times 10^5 = 0.0845 \times 10^9 \)
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Now we can compare:
- \( 6.25 \times 10^9 \)
- \( 0.0845 \times 10^9 \)
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Since \( 6.25 > 0.0845 \), we conclude that:
- \( 6.25 \times 10^9 > 8.45 \times 10^5 \)
So, the answer is: \[ 6.25 \times 10^9 > 8.45 \times 10^5 \]