1. Addition: a + b = c
2. Subtraction: a – b = c
3. Multiplication: a x b = c
4. Division: a ÷ b = c
5. Exponents: a^n = c
6. Square root: √a = b
7. Order of operations: PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction)
8. Fractions: a/b
9. Decimals: 0.1, 0.2, 0.3, etc.
10. Percentages: a% = a/100
11. Ratios: a:b
12. Proportions: a/b = c/d
13. Area of a rectangle: A = l x w
14. Perimeter of a rectangle: P = 2l + 2w
15. Area of a triangle: A = 1/2bh
16. Perimeter of a triangle: P = a + b + c
17. Circumference of a circle: C = 2πr
18. Area of a circle: A = πr^2
19. Volume of a cube: V = s^3
20. Volume of a rectangular prism: V = l x w x h
21. Volume of a cylinder: V = πr^2h
22. Pythagorean theorem: a^2 + b^2 = c^2
23. Mean: (a + b + c + … + n) / n
24. Median: the middle number in a set of numbers
25. Mode: the number that appears most frequently in a set of numbers.
