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| Students are guessing Mr. Lo's weight in lb by observing the photo. |
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| Students are trying to write the answers for Mr. Lo's weight. |
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| Students are trying to estimate the weight of 100 marbles by using just a single electronic balance. |
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| Students have only one chance to pick up a pile of 25 chips by just observing the thickness of a pile of 5 chips. |
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| Students are using different methods to estimate the weight of 100 marbles. |
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| It seems to be successful that the student can pick up a pile of 25 chips at one time. |
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| Mr. Lo is measuring his body weight by standing onto a bathroom scale. His actual weight is going to be revealed. |
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| Owww! Mr. Lo weighs 227 lb, which is much heavier than Mr. Choi, who is standing next to him in the photo on board. |