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Multiplication Example: Finding Product of 840 and 5

Learn how to estimate and multiply 840 by 5 step by step in this math lesson example. Compare the result to the estimate for reasonableness.

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Multiplication Example: Finding Product of 840 and 5

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  1. 4-4 Lesson 4-4 Example 3 Find the product of 840 and 5. Estimate first. Step 1 Estimate. 800 × 5 = 4,000

  2. 4-4 Lesson 4-4 Example 3 Find the product of 840 and 5. Estimate first. Step 2 Rewrite the problem in vertical format. 840 × 5

  3. 4-4 Lesson 4-4 Example 3 Find the product of 840 and 5. Estimate first. Step 3 Multiply 5 times the digit in the ones column. 5 × 0 = 0 840 × 5 0

  4. 4-4 Lesson 4-4 Example 3 Find the product of 840 and 5. Estimate first. Step 4 Multiply 5 times the digit in the tens column. 5 × 4 = 20 2 840 × 5 0 0

  5. 4-4 Lesson 4-4 Example 3 Find the product of 840 and 5. Estimate first. Step 5 Multiply 5 times the digit in the hundreds column. 5 × 8 = 40 Add the 2 above the hundreds column. 2 + 40 = 42 2 840 × 5 4,2 0 0

  6. 4-4 Lesson 4-4 Example 3 Find the product of 840 and 5. Estimate first. Step 6The product is 4,200. Compare to your estimate for reasonableness.

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