Logarithmic Concepts and Calculations

log(a) / log(b)

log(a) * log(b)

log(a) - log(b)

log(a) + log(b)

Multiply the digits before the decimal

Add 1 to the number of digits after the decimal

Divide the digits after the decimal

Subtract 1 from the number of digits before the decimal

3

2

0

1

By adding the digits of the number

By looking up the first two digits in the first column and the next digit in the second section

By multiplying the digits of the number

By subtracting the digits of the number

1.7380

0.7480

0.7380

1.7480

Divide the log values

Add the log values

Multiply the log values

Subtract the log values

To check the accuracy of the log value

To determine the mantissa

To find the characteristics of the number

To convert the log value back to the original number

After three digits from the left

After four digits from the left

After two digits from the left

After one digit from the left

16.66

19.66

18.66

17.66

To find a different result

To ensure the result is consistent and accurate

To practice using a calculator

To check the speed of calculation