1.2 Estimation with Whole Numbers

Estimate sums, differences, products, and quotients of whole numbers.

Remember!

When you round, you

look to the digit to the

right.

5 or greater – round UP

4 or less – round DOWN

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

1802 + 2182 + 1999

2000 + 2000 + 2000

Underestimate –

an estimate that is less than the exact answer.

Overestimate –

an estimate that is more than the exact answer.

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