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 division problem, share their methods, discuss the nice numbers and factors method, and then do more problems using nice numbers and factors.
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.