class 1 you learn numbers
0, 1, 2, 3, 4....9
class 3 you learn additions
1+1=2 class 5 you learn multiplications means you learned shortcut for addition
4 + 4+ 4=3•4 class 8 you learn Exponents(power) means you learned shortcut for multiplication
2•2•2 =23
class 10 you learn Logarithm means you learned shortcut for exponents 10•10=102=log10(100)=2
and in class 12 you learn use of all this classics

Classic use of log
How long would it take a town of 2000 people to grow to 2500 people at a rate of 7% annually?
Soln: use log with P=P0(1+r)?
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