P – EC – PP14
About how many books are there?P – EC – PP15
Would a better estimate for the following picture be 50 or 100?P – EC – PP16
What would you use as a reference to estimate the number of books in the pile?P – EC – PP17
Would a better referent be 10 or 25 for estimating the number of books in the pile?Page 25 of 27