Remember that you can round numbers to any place when estimating sums and differences.
Estimate each sum or difference.
1. 652, 198 + 49,753
2. 8, 352 - 3,421
3. 17,586 - 9,483
4. 823, 725 + 44,851
5. 1,440 - 933
6. 55,748 - 28,392
7. 4,981+ 6,193
8. 995,275 + 4,921