1. Estimate the number of peanuts in this jar.
2. A box contains some buttons. Four people estimate the number of buttons in the box. Their estimates were 205, 195, 192 and 173.
One of the estimates was seventeen out, one was five out, one was fifteen out and the other estimate was two out.
How many buttons were in the box?
Topics: Starter  Estimating  Problem Solving
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=September17 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to an interactive estimating activity.