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Vocabulary – Trailing Zeros: Both Factors
publish date: 2026/05/10 11:32:56.590836 UTC
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How many zeros do you attach to find \(400 \times 2{,}000\)?
Correct Answer
5
Explanation
400 has 2 trailing zeros; 2,000 has 3 trailing zeros. Total: \(2 + 3 = 5\) zeros. Multiply nonzero parts: \(4 \times 2 = 8\). Attach five zeros: \(400 \times 2{,}000 = 800{,}000\).
Reference
Mathematics for college students