Using a variety of photographed objects, the author helps readers to develop their estimation strategies by first looking at groups of ten, one hundred, and one thousand. Numerous opportunities are provided for students to use groupings and patterns to estimate quantities of colourful everyday objects. Each picture includes hints for helpful estimation strategies.

Mathematics grade 2 (2008). Mathematics grade 3 (2009). Mathematics grade 4 (2007). Mathematics grade 5 (2008).