Estimate the number of fish in the picture above.  Estimate means to find a number that is close to the exact answer.   Explain how you found your answer.







For 4th and 5th graders:  Fish aquariums come in various sizes (5 gallons, 10 gallons, 20 gallons, 29 gallons, 55 gallons, and 100 gallons).  If we need two gallons of water for each fish, what size aquariums should we use for all of our fish?