Math Guide
Mathematical Calculators: Theory & Applications
From basic arithmetic to advanced scientific computations
Scientific Calculator Features
Trigonometry
sin, cos, tan, π
Logarithms
log, ln, e
Constants
π, e, φ
Order of Operations
Our calculators strictly follow PEMDAS:
P
E
M
D
A
S
Example Calculation
3 + 5 × 2
= 3 + (5 × 2)
= 3 + 10
= 13
Percentage Calculations
Basic Percentage
X% of Y = (X/100) × Y
25% of 80 = 20
Percentage Change
[(New-Old)/Old] × 100
50 to 75 = 50% increase
Reverse Percentage
If X is Y%, then Total = X/(Y/100)
15 is 20% of 75
All Math Calculators
Precision tools for students and professionals