PRAXIS 7813 Exam with Correct Answers
1. Order of Opera- (PEMDAS): Parentheses ’Exponents ’Multiply/Divide ’Add/Subtract
tions
2. Fractions: Must have a common denominator
Add/Subtract
3. Fractions: Multi- Multiply the numerator and denominator straight across
ply
4. Fractions: Divide "keep, switch, flip"
-keep the first fraction, switch the division sign to multiplication, and flip the second
fraction to its reciprocal
-Then, multiply the numerators and the denominators, and simplify the result if
needed
5. Percent to Deci- % ’decimal: ÷100
mal
6. Decimal to Per- Decimal ’%: ×100
cent
7. Ratios/Propor- Cross multiply ’a/b = c/d ’ad = bc
tions
8. Prime factoriza- break a number into primes (60 = 2 × 2 × 3 × 5)
tion
9. Perimeter add all side lengths
10. Area of a Rectan- L x W
gle
11. Area of a Triangle ½bh
1/6
, PRAXIS 7813 Exam with Correct Answers
12. Area of a Parallel- bh
ogram
13. Area of a Trape- A = ½ (a + b) h
zoid
14. Area of a Circle πr²
15. Circumference C = 2πr or πd
16. Volume of a Rec- lwh
tangular Prism
17. Volume of a Cylin- πr²h
der
18. Pythagorean a²+b²=c²
Theorem
19. Triangle Sum 180 degrees
20. Line 180 degrees
21. Circle 360 degrees
22. Solving Equa- isolate variable with inverse operations
tions
23. Slope Formula m = (y2-y1) / (x2-x1)
24. Coordinate Plane I (+,+)
Quadrants II (-,+)
III (-,-)
IV (+,-)
2/6
1. Order of Opera- (PEMDAS): Parentheses ’Exponents ’Multiply/Divide ’Add/Subtract
tions
2. Fractions: Must have a common denominator
Add/Subtract
3. Fractions: Multi- Multiply the numerator and denominator straight across
ply
4. Fractions: Divide "keep, switch, flip"
-keep the first fraction, switch the division sign to multiplication, and flip the second
fraction to its reciprocal
-Then, multiply the numerators and the denominators, and simplify the result if
needed
5. Percent to Deci- % ’decimal: ÷100
mal
6. Decimal to Per- Decimal ’%: ×100
cent
7. Ratios/Propor- Cross multiply ’a/b = c/d ’ad = bc
tions
8. Prime factoriza- break a number into primes (60 = 2 × 2 × 3 × 5)
tion
9. Perimeter add all side lengths
10. Area of a Rectan- L x W
gle
11. Area of a Triangle ½bh
1/6
, PRAXIS 7813 Exam with Correct Answers
12. Area of a Parallel- bh
ogram
13. Area of a Trape- A = ½ (a + b) h
zoid
14. Area of a Circle πr²
15. Circumference C = 2πr or πd
16. Volume of a Rec- lwh
tangular Prism
17. Volume of a Cylin- πr²h
der
18. Pythagorean a²+b²=c²
Theorem
19. Triangle Sum 180 degrees
20. Line 180 degrees
21. Circle 360 degrees
22. Solving Equa- isolate variable with inverse operations
tions
23. Slope Formula m = (y2-y1) / (x2-x1)
24. Coordinate Plane I (+,+)
Quadrants II (-,+)
III (-,-)
IV (+,-)
2/6
