Math Tips

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1. Perimeter of a rectangle
A = 2l + 2w or 2(l + w)

If Length = 4 and width = 6

• A = 2(4+6)
• A = 20
2. Perimeter of a square
A = 4s
3. Area of a triangle
A = (1/2)bh
4. Area of a rectangle
A = bh or lw
5. Area of a square
A = S2
6. Diameter of a circle
d = 2r
7. Circumference of a circle
C = 2πr or πd
8. Area of a circle
A = πr2
9. Volume of rectangular solids
V = lwh
10. Pythagorean theorem
a2 + b2 = c2
11. Average of a set of numbers: Average
Sum of the numbers ÷ The amount of numbers in the set

Average of 2, 5, 6, 3, 4

Average = 2+5+6+3+4 / 5 = 20/5 = 4
12. Right angles measure
90°
13. The sum of the interior angles of a triangle is
180°
14. The sum of the interior angles of a quadrilateral is
360°
15. Complementary angles add up to
90°
16. Supplementary angles add up to
180°
17. 1 foot =
12 inches
18. 1 yard
3 feet
19. 1 meter =
100 centimeters
20. 1 kilometer =
1,000 meters
21. 1 pound =
16 ounces
22. 1 cup =
8 ounces
23. 1 pint =
2 cups
24. 1 quart =
2 pints or 4 cups
25. 1 gallon =
4 quarts
26. 1 kilogram =
1,000 grams
27. Commit the order of operations to memory: Think of PEMDAS  and you'll be set.
Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
 Author: vmacpaix ID: 184406 Card Set: Math Tips Updated: 2012-11-19 16:14:43 Tags: Entrance Exams SSAT Math formulas Folders: Description: Formulas to know for entrance exams Show Answers: