Know that unknown side lengths can be calculated from the perimeter and known side lengths
Lesson 4 / 10
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I can calculate unknown side lengths of rectangles from the perimeter and known side lengths.
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Subtraction and halving can be used to calculate the missing side length of a rectangle.
If you know the perimeter and one of the side lengths you can subtract the known sides and halve the difference.
Mental and written methods can be used to calculate the perimeter of a 2D shape.
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