# Logarithms

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Definition of a Logarithm:

If y = bx, then the logarithm, to the base b of a positive number is denoted by logb y and is defined by logb y = x.

And so, if 9 = 32, then the logarithm to the base 3 of 9 is defined by log3 9 = 2.

DON’T BE INTIMIDATED BY LOGARITHMS! ! ! Use this flashcard drill to become a master of logarithm basics.

CLICK HERE TO PRACTICE LOGS WITH VARIABLES

• log2 2 = ;1
• log2 4 = ; 2
• log2 8 = ; 3
• log2 16 = ; 4
• log2 32 = ; 5
• log2 64 = ; 6
• log2 128 = ; 7
• log2 256 = ; 8
• log2 512 = ; 9
• log2 1024 = ; 10
• log3 9 = ; 2
• log3 27 = ; 3
• log3 81 = ; 4
• log3 243 = ; 5
• log3 729 = ; 6
• log3 2,187 = ; 7
• log4 16 = ; 2
• log4 64 = ; 3
• log4 256 = ; 4
• log4 1024 = ; 5
• log5 25 = ; 2
• log5 125 = ; 3
• log5 625 = ; 4
• log5 3,125 = ; 5
• log2 (1/4) = ; -2
• log2 (1/8) = ; -3
• log2 (1/16) = ; -4
• log2 (1/32) = ; -5
• log3 (1/9) = ; -2
• log3 (1/27) = ; -3
• log3 (1/81) = ; -4
• log3 (1/243) = ; -5
• log4 (1/16) = ; -2
• log5 (1/25) = ; -2

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