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Natural logarithm

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Natural logarithm

L N is the natural logarithm, with base e. Press L N, type 20, and press equals: 2.995732274.

▶ Watch this step in the video (16:41)

← PreviousInverse hyperbolic: 2nd F arc hyp
Next →Common logarithm
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In this part

PART 2: Arithmetic and functions

Arithmetic operations
  • Division before addition
  • A fraction bar needs parentheses
  • Negative numbers: +/−
  • Powers of ten: Exp
Constant calculations
  • Add or subtract the same number
  • Divide or multiply by the same number
Functions
  • Sine in degrees
  • Cosine in radians (DRG: DEG → RAD)
  • Inverse tangent in grads (DRG: RAD → GRAD)
  • Hyperbolic functions: hyp
  • Inverse hyperbolic: 2nd F arc hyp
  • Natural logarithm
  • Common logarithm
  • e to the power x
  • 10 to the power x
  • Reciprocal: x⁻¹
  • Powers: yˣ and x²
  • A power of a power
  • Cube: x³
  • Square root and x-th root
  • Cube root
  • Factorial
  • Permutations
  • Combinations
  • A real lottery: 6 balls out of 49
  • How many different draws are there?
  • Your chance of winning
  • Percent 1: a percentage of a number
  • Percent 2: what percentage?
  • Percent 3: find the whole
  • Add a percentage (mark-up)
  • Subtract a percentage (discount)
  • Range of inverse trig answers
Angle unit conversion
  • Convert 90°
  • Convert an angle answer

Calculators

  • CASIO fx-300ES PLUS
  • SHARP EL-531XT
  • SHARP EL-W516T

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