Students estimate a division problem, share their methods, discuss the nice numbers and factors method, and then do more problems using nice numbers and factors.
Students estimate an addition problem, share their methods, discuss grouping nice numbers, and then do a problem using this method, then design a question showing how it uses the method.
Students estimate a subtraction problem, share their methods, discuss the rounding one number method, and then do more problems by rounding one number.
Assessment focus: ability to use contextual clues to infer meaning of a word. (There is a link to the text used for this resource in the Using this Resource section.) Reading age 9.5-10.5. SJ-2-2006. Text provided.