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This problem offers great opportunities for mental arithmetic and estimation. It can also be used as an opening to discussing the order of operations.
Can you work out how many of each kind of pencil this student bought?
Bluey-green, white and transparent squares with a few odd bits of shapes around the perimeter. But, how many squares are there of each type in the complete circle? Study the picture and make an estimate.
What number could replace * so that */5 is between 3 and 4?