Answer:
600,000 = 6 x 10^5
Explanation:
✅ 6 x 10^5 = 6 x 100,000 = 600,000
❌ 6 x 10^6 = 6 x 1,000,000 = 6,000,000
❌ 5 x 10^5 = 5 x 100,000 = 500,000
This answer is not near 623,453
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