Slide 2:
Remember!
When you round, you look to the digit to the right.
5 or greater – round UP
4 or less – round DOWN
Slide 3:
Clustering - estimating a sum when the addends are about the same.
Slide 4:
1802 + 2182 + 1999 2000 + 2000 + 2000
Slide 5:
Underestimate –
an estimate that is less than the exact answer.
Slide 6:
Overestimate –
an estimate that is more than the exact answer.
Slide 7:
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