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Shapes in a Grid

Stage: 2 Challenge Level: Challenge Level:2 Challenge Level:2

It might help to have a copy of the problem printed out.
What do you know about the red triangle?
How can you use what you know about the red triangle to work out the value of other shapes?
How will you remember what you have worked out so far?
How do the totals at the ends of the rows and at the foot of each column help?