From Hamilton's own problems

If there are 1,253 plants in one acre of a rainforest, how many plants are in 1,904 acres?




Please, no calculators...

From Hamilton's own problems

 The fastest bird in the world goes 106 miles an hour. How far would that bird go in two and a half minutes? 


Please, no calculators...

From Hamilton's own problems

  A Ponderosa Pine is 7/20 water. An apple tree is 0.2 water. A cotton tree is 50% water. A Black Cherry Tree is 0.11 water. An American elm is 9/25 water. Arrange them from least percent water to greatest percent water.

From Hamilton's own problems

 The deforestation speed in Brazil is 2.55 million hectares a year today. If each year there is 1/10 more deforestation than the year before, how many hectares will be deforested in 5 years cumulatively?

 Round to the nearest ten thousand.


NB: The answer we came up to is as starting without the base year.