For example
Line up the protractor's centre mark on the corner you are measuring.
In Grade 4
Children line the protractor centre on the point and one arm on zero before reading anything.
Watch out for
Children often place the edge of the protractor on the point instead of its centre mark. The centre goes on the corner.
Say it at home
If there is a protractor at home, practise lining up the centre before reading.
Try it together
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