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MATHEMATICAL THINKING RESEARCH GROUP
mathematics, thinking, teaching, learning critical thinking, problem solving, non routine
Double up!
A lily pad grows so that each day it doubles its size. On the twentieth day of its life, it completely covers a pond. On what day was the pond half covered?
Hints
1. In doubling, if 4th day is 20, 3rd day will be 10, 2nd day will be 5.
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