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 Fill a jar with  jellybeans. Ask the students to write on a slip of paper their estimates of how many jellybeans are in the jar. They must sign the slips and deposit them in a folder. Challenge kids to think of an easy way to discover the answer by thinking in terms of weight. Use a scale that indicates either grams or ounces. Have different children do the computations and record their findings on the chalkboard. Follow these steps: -Pour the beans on the scale and weigh them. -Weigh a small paper cup. Fill it with beans and weigh it again. -Subtract the weight of the cup to find the weight of the beans. -Count the beans in this small sample. -Divide the weight of all the beans by the weight of the sample. -Multiply that answer by the number of beans in the sample to find the number of beans in the jar. The game winner wins the jar. PS: Consider doing more fun printable math activities.