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A million

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 Give each child a 2.5 cm (1") square construction paper template frame. Ask everyone to place the square randomly on a well grassed area about 3m by 3m (10' x 10'). Each child counts the number of blades in his or her square. The sum of the blades in all the samples is found and averaged. This figure provides a base for calculating the size that an area would have to be to contain a million blades of grass.  This is a great problem to donate to a willing eighth grade class to solve. Encourage children to visualize a hot dog replacing each tiny blade of grass. Then introduce the word "googol" and note that this term represents all the units that would be contained in a million staked-out plots. Challenge them to express "googol" in numerals (a 1 followed by 100 zeros). PS: Consider doing more fun printable math activities.