Chapter 1 - Whole Numbers - 1.7 Rounding Whole Numbers - 1.7 Exercises - Page 74: 53

estimated:12760 exact:12605

Estimate: Exact: 8000  8215 (All digits changed to 0, except first digit which is rounded) 60  56 (All digits changed to 0, except first digit which is rounded) 700  729 (All digits changed to 0, except first digit which is rounded) +4000  3605 (All digits changed to 0, except first digit which is rounded) 12760 (Estimated Answer) Exact: 8215 + 56 + 729+3605 = 12605