Rounding Numbers Lesson 1.9.

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Presentation transcript:

Rounding Numbers Lesson 1.9

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

Strong Numbers: 5 6 7 8 9 *Have the strength to CHANGE a number (+1) 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

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

Rounding Numbers Step Summary: Identify Underline 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

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