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Rounding Numbers

Rounding Numbers. Lesson 29. Math Vocabulary. To “round” a # means: To use the “strength” of numbers to change or keep another number’s value, so that the entire number is not exact but close to the original. Two types of #s. Strong Numbers: 5 6 7 8 9

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Rounding Numbers

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  1. Rounding Numbers Lesson 29

  2. Math Vocabulary To “round” a # means: To use the “strength” of numbers to change or keep another number’s value, so that the entire number is not exact but close to the original

  3. Two types of #s Strong Numbers: 5 6 7 8 9 *Have the strength to CHANGE a number (+1) Weak Numbers: 0 1 2 3 4 **Have no strength and keep numbers the same

  4. Rounding Numbers Steps: • Identify # to be rounded • Underline# to be rounded • Circle # AFTER underlined # • Determine if # AFTER is strong or weak… • Round • Change remaining #s AFTER to 0s. Examples: Round 283 to nearest hundred: 283 ≈ 300 Round 283 to nearest ten: 283≈ 280

  5. Rounding Numbers Step Summary: • Identify • Circle • Determine strength • ROUND • Change leftovers to 0s Examples: Round 39,567,000 to nearest million: 39,567,000 ≈ 40,000,000 Round 4,367,633 to nearest thousand: 4,367,633 ≈ 4,368,000

  6. Practice… • Round 1760 to the nearest hundred. • Round 5489 to the nearest thousand. • Round 186,282 to the nearest ten thousand.

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