How many different shapes with an area of 2 square units can you make by joining dots on this grid with straight lines?
Teacher: Click on the dots above to show joining lines.
A printable sheet for student use is available here.
Topics: Starter  Area  Geometry  Mensuration  Problem Solving  Shape
The challenge: Write your name so that it covers an area of exactly 100 cm squared.
— Ilona Vashchyshyn(@vaslona) November 16, 2018
Love the different strategies students used here. E.g. Leia, who chose to make each letter 25 cm^2. Notice the revisions on the A.#mathchat #MTBoS Cc @PaiMath pic.twitter.com/FowEQoL4I6
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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=September10 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to more traditional exercise on area and perimeter.
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See the National Curriculum page for links to related online activities and resources.