Unit 5 Notes
Estimating Sums and Differences
Estimate: Find an approximate answer or solution.
 Use rounding to quickly estimate sums or differences
 Round each number to the same place value
EXAMPLES:
Estimate to the nearest whole number
20.791 +
↓
5.25
+
3.84
↓
21 +
5
↓
+
4
Estimate to the nearest tenth
17.69
↓
17.7
+
0.686
↓
0.7
=
18. 4
= 30