I find that pupils are pretty good when it comes to rounding off for figures but sorta weak when it comes to estimate. Having worked with P4 kids before, I find that it is because they are not able to relate the size of the object to the size of the container that contains the objects. As such they tend to over or under estimate.
So I brought a jar of cookies today to the class and asked the class to estimate the number cookies. The rules were pretty simple
1) No shaking of my cookie jar
2) No stealing of cookies from my jar.
The number of cookies will be revealed real soon!
