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 201, 196, 178 and 169.
One of the estimates was twelve out, one was fifteen out, one was twenty out and the other estimate was three 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.