Estimate the number of chillies in this picture:
Topics: Starter  Estimating
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Estimate how many tomatoes are in this bowl.
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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=February7 However it would be better to assign one of the student interactive activities below. 

Students could collect everyone's estimates on a spreadsheet.
Use this data to calculate the median estimate. The student whose estimate is closest to the median wins a chilli.
Here is the URL which will take them to a different type of estimating activity.