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Estimate: 6,457 + 3,452 =
6,000 + 3,000 = 9,000
Estimate: 22,235 - 9,782 =
20,000 - 10,000 = 8,000
Round to the nearest hundred: 6,782
6,800
Round to the nearest ten: 2,821
2,820
Front End Estimate: 3,789 + 8,609 =
3,000 + 8,000 = 11,000
Mrs. Byrne has 2,467 fiction books and 1,298 nonfiction books. About how many books does Mrs. Byrne have altogether?
Mrs. Byrne has about 3,000 books!
What is the partial sum for the thousands place? 5,683 + 2,375
5,000 + 2,000 = 7,000
What is the partial sum for the hundreds place? 5,683 + 2,375
600 + 300 = 900
What is the partial sum for the tens place? 5,683 + 2,375
80 + 70 = 150
What is the partial sum for the ones place? 5,683 + 2,375
3 + 5 = 8
Add. 7,892 + 5,278 =
13,170
Add. 9,234 + 287 =
9,521
Add. 567,892 + 253,719 =
821,611
Estimate. 567 + 432
1000
Round to the nearest thousand. 234,678
235,000
