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Dacey LS, Collins A. Zeroing in on number and operations : key ideas and common misconceptions, grades 3-4. Portland, Me.: Stenhouse Publishers; 2010.

Collins A, Dacey LS. Zeroing in on number and operations : key ideas and common misconceptions, grades 7-8. Portland, Me.: Stenhouse Publishers; 2010.

Collins A, Dacey LS. Zeroing in on number and operations : key ideas and common misconceptions, grades 5-6. Portland, Me.: Stenhouse Publishers; 2010.