CASIO

Use the key to input logab as log (a,b).
Base 10 is the default setting if you do not input anything for a.
The key also can be used for input, but only while Natural Display is selected. In this case, you must input a value for the base.

Example 1: log10 1000 = log 1000 = 3

• 1000
• 3

Example 2: log2 16 = 4

• 2(,) 16
• 4

• (MthIO-MathO, MthIO-LineO)  216
• 4

Example 3: log2(43) = 6  (MthIO-MathO, MthIO-LineO)

• 2
• 6

Example 4: log2(4)3 = 8  (MthIO-MathO, MthIO-LineO)

• 24
• 8

Example 5: To calculate ln 90 (= loge 90) to three significant digits  (Sci 3)

• (SETUP)(Sci)
  90
• 4.50×100