Number and Operations in Base Ten: Rounding Multi-Digit Whole Numbers to Any Place (CCSS.4.NBT.3)
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Common Core 4th Grade Math › Number and Operations in Base Ten: Rounding Multi-Digit Whole Numbers to Any Place (CCSS.4.NBT.3)
What is 3,276 rounded to the nearest hundred?
3,300
3,200
3,280
3,000
Explanation
Think on a number line from 3,200 to 3,300. The midpoint is 3,250. Since 3,276 is to the right of 3,250, it is closer to 3,300. Place-value model: when rounding to hundreds, look at the tens digit (7). Because it is 5 or more, increase the hundreds digit and make tens and ones zero.
What is 4,589 rounded to the nearest thousand?
4,000
4,590
5,000
4,600
Explanation
On a number line from 4,000 to 5,000, the midpoint is 4,500. Since 4,589 is to the right of 4,500, it is closer to 5,000. Place-value model: rounding to thousands means checking the hundreds digit (5). A 5 means round up the thousands place.
What is 8,645 rounded to the nearest ten?
8,640
8,600
8,700
8,650
Explanation
Consider the number line between 8,640 and 8,650. The midpoint is 8,645. At the midpoint, we round up to 8,650. Place-value model: when rounding to tens, look at the ones digit (5). A 5 rounds the tens place up.
What is 9,501 rounded to the nearest thousand?
9,000
10,000
9,500
9,600
Explanation
On a number line from 9,000 to 10,000, the midpoint is 9,500. Since 9,501 is just to the right of 9,500, it is closer to 10,000. Place-value model: to round to thousands, check the hundreds digit (5). A 5 or more increases the thousands place by one.