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Multiply decimals by decimals

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Learn it Multiply as if there were no decimal points, then give the answer as many decimal places as both numbers have together. Estimate to check.

Example: $3.6 \times 0.45$

  1. $36 \times 45 = 1{,}620$.
  2. Decimal places: 1 + 2 = 3.
  3. $1.620 = 1.62$. Estimate: $4 \times 0.5 = 2$ ✓ (close).

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