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Rounding Natural Numbers and Multiplying 3-Digit Numbers by 2-Digit Numbers

Rounding Natural Numbers and Multiplying 3-Digit Numbers by 2-Digit Numbers. Learning Goals. Students will learn to round natural numbers so that they can approximate the result of given equations.

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Rounding Natural Numbers and Multiplying 3-Digit Numbers by 2-Digit Numbers

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  1. Rounding Natural Numbers and Multiplying 3-Digit Numbers by 2-Digit Numbers

  2. Learning Goals • Students will learn to round natural numbers so that they can approximate the result of given equations. • Students will use their knowledge of multiplying 1-digit numbers so that they can multiply 3-digit numbers by 2-digit numbers.

  3. Vocabulary • Approximate Value • Equation • Factor • Multiplication • Multiply • Product • Rounding

  4. Rounding Natural Numbers • When you round a number, you replace it with one of approximate value • Rounding numbers helps you estimate operations and makes mental calculation easier

  5. Rounding 542 329 to the Nearest Thousand

  6. Let’s Round Some Numbers • 322 190 (nearest Th) • 15 200 (nearest TTh) • 295 372 (nearest T) • 186 (nearest H) • 5 173 (nearest Th) • 322 000 • 20 000 • 295 370 • 200 • 5 000

  7. Individual Work • The reference page in your workbook is A-12 • Take 5 minutes to complete: • Question #1 on page A-12 • Question #2 on page A-13 • Question #3 on page A-13 • Question #4 on page A-13

  8. Multiplying 3-Digit Numbers by 2-Digit Numbers • Understanding a multiplication question: 829x74 = 61 346 1st Factor multiplied by 2nd Factor equalsthe Product

  9. Multiplying 3-Digit Numbers by 2-Digit Numbers • Multiply each digit in the number 829 by 4 (units). Don’t forget to carry! x

  10. Multiplying 3-Digit Numbers by 2-Digit Numbers • Place a 0 in the units column. • Multiply each digit in the number 829 by 7 (tens). x

  11. Multiplying 3-Digit Numbers by 2-Digit Numbers • Add the 2 products to find the final product of the multiplication x +

  12. Individual Work • The reference page in your workbook is page A-14 • Take 5 minutes to complete: • Question #1 on page A-15 • Question #2 on page A-15 • Question #3 on page A-16

  13. Put It All Together • Complete questions 1 and 2 on page A-17 • Supplementary Activity 1-4

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