Multiplication & Rounding to One MillionVersión en línea
Multiply numbers and round to one million.
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Slide 1: What is rounding to a million?
Rounding to one million means estimating a number to the nearest 1,000,000. We look at the hundred-thousands place to decide whether to go up or down.
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Slide 2: The rounding rule
To round to the nearest million, if the hundred-thousands digit is 5 or more, round up. Otherwise, round down to the previous million.
Round 2,345,678 to the nearest million. Since 345,678 is less than 500,000, it rounds to 2,000,000.
Round 6,745,300 to the nearest million. With 745,300 ≥ 500,000, it rounds to 7,000,000.
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Slide 5: Why rounding helps
Rounding simplifies large numbers, makes estimates faster, and aids in budgeting, comparing values, and quick calculations in real life.
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Slide 6: Multiplication basics
When multiplying, you may obtain large results. Rounding after multiplication gives a quick, reasonable approximation close to the exact product.
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Slide 7: Step-by-step method
Steps: 1) multiply numbers exactly, 2) determine the nearest million, 3) round the product accordingly.
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Slide 8: Practice problem 1
Compute 3 × 1,050,000. Exact product is 3,150,000, which rounds to 3,000,000.
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Slide 9: Practice problem 2
Compute 7 × 998,000. Exact product is 6,986,000, which rounds to 6,986,000 rounded to 7,000,000.
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