This document discusses estimating sums, differences, products, and quotients of whole numbers. It explains how to round numbers and the concepts of clustering, underestimating, and overestimating when adding whole numbers that are close in value. The document also provides image attributions from Flickr for any images included.

1. 1.2 Estimation with Whole Numbers Estimate sums, differences, products, and quotients of whole numbers.

2. Remember! When you round, you look to the digit to the right. 5 or greater – round UP 4 or less – round DOWN

3. Clustering - estimating a sum when the addends are about the same.

4. 1802 + 2182 + 1999 2000 + 2000 + 2000

5. Underestimate – an estimate that is less than the exact answer.

6. Overestimate – an estimate that is more than the exact answer.

7. Image Attributions Slide 1: Image: 'three_feet' www.flickr.com/photos/26084283@N00/72697229 Slide 2: Image: 'stickynote' www.flickr.com/photos/23963249@N02/2325865367 Slide 3: Image: 'Gathering roses( bright orange)' www.flickr.com/photos/28481088@N00/182314313 Slide 5: Image: 'Sun On The Petals' www.flickr.com/photos/98799884@N00/302782756 Slide 6: Image: 'Sunset on the Charles' www.flickr.com/photos/64165252@N00/141931319