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Rounding Numbers to the Nearest Hundred by Mrs. Zagrodny
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When you find the hundred that is closest to a number, you are rounding.
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For example, 400 is the closest ten to 360. So, 360 to the nearest 100 is rounded to 400.
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Again, let’s think about a number line like a roller coaster.
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You might think about a number line that looks like this: 100300200
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On this number line, what number would come half way between 100 and 200? 100300200 150
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What number would come half way between 200 and 300? 100300200 150250
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What hundred would be next? 100300200 150250350 400 What number would be half way between?
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Can you guess about where 170 would be on this number line? 100300200 150250350 40 170
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100300200 150250350 400 170 If the roller coaster stopped, what number would it roll to?
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Can you guess about where 230 would be on this number line? 100300200 150250 350 400 230
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100300200 150250350 400 230 If the roller coaster stopped, what number would it roll to?
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Can you guess about where 360 would be on this number line? 100 300200 150250350 400 360
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What would you round it to? 100300200 150250350 400 360
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Can you guess about where 410 would be on this number line? 100300200 150250350 400 410
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What would you round it to? 100300200 150250350 400 410
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Can you guess about where 190 would be on this number line? 100300200 150250350 400 190
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Can you guess about where 190 would be on this number line? 100300200 150250350 400 190
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100300200 150250350 400 190 What would you round it to?
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What about a number like 250? It’s right in the middle! 100300200 150250350 40
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Our rule is to round to the next hundred. 100300200 150250350 400
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100300200 150250350 40 Tell a number that would round to 100. 110 120 130 140
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When you round to the nearest hundred, look in the tens place. If it has 1,2,3, or 4 round down. If it has 5, 6,7, 8, or 9 round up.
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To round remember this rhyme, 5, 6, 7, 8, 9 GO UP all the time!!
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Rounding numbers is so fun, We will do it 'till we're done. If a number's 1-4, Round it down right through the floor. If a number's 5-9, Round it up it is just fine. Round up, Round down, 1,2,3,4 --- 1-2, 3-4
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Now it’s your turn! You can get some help from the number line.
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What hundred is closest to 560? Put your bean on the closest hundred.
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What hundred is closest to 790? Put your bean on the closest hundred.
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What hundred is closest to 830? Put your bean on the closest hundred.
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What hundred is closest to 990? Put your bean on the closest hundred.
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What hundred is closest to 650? Put your bean on the closest hundred.
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What hundred is closest to 940? Put your bean on the closest hundred.
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Are you roller coaster ready for an assignment?
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