P – EC – RT8

When estimating a large number of people, Janie asked people to gather into groups of 10. What would Janie’s reasoning be for asking people to group? Could she have grouped them in other ways?

P – EC – RT9

Taylor and Sam estimated the number of people in line for hockey tickets. Both used referents of 20, but they had different estimates. How is this possible if they used the same referent?

P – EC – RT10

Terry and Reid estimated the number of people in line for concert tickets. Terry used a referents of 10 while Reid used a referent of 20. They estimated the same number of people. How is this possible if they used different...

P – EC – WP10

A student had drawn dots all over his scribbler page. What would you use as a referent for the following picture? Explain your thinking.

P – EC – OE12

What would you use as a referent if you had to estimate the number of students on a bus?

Subscribe To Our Newsletter

Join our mailing list to receive the latest news and updates from Dr. David Costello.

You have successfully subscribed!