Eye training. Clump counting. Box and count. Bruce Goldstone offers strategies and examples of how to estimate in this numerically challenging follow-up to Great Estimations (Henry Holt, 2006). As in his original volume on how to strategically guess at the number of objects in a group, Goldstone uses eye-catching photographs of items to be estimated, from the number of rubber ducks in arrangements growing larger on successive pages to the number of seeds on a dandelion, and much more. He also includes estimation exercises on how to figure height, weight, size, and volume. Each page’s puzzler includes a hint on the strategy to use in a book that offers skill-building and opportunities for practice that can be easily extended beyond the page. (Ages 7–11)

To find out how many rubber duckies are on the cover of this book you could count each one—or you could estimate. An estimate is a good guess. Are there more than ten rubber ducks? Are there fewer than a thousand?

Those estimates are not very accurate. A great estimate is close to the real number. Filled with fun, creative examples, this companion to Great Estimations will show you how to train your eyes and your mind to make really great estimations about length, volume, area, and much more.