# Grade 9 Math Exam Review

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1. Natural Numbers
• The counting numbers (1,2,3,4,5...)
• All positive numbers
2. Square Numbers
Numbers that create a perfect square (1,4,9,16,25...)
3. Triangular Numbers
Numbers that create a perfect triangle (1,3,6,10...)
4. Rectangular Numbers
Any composite number
5. Whole Numbers
Natural numbers and 0
6. Integers
Positive numbers, negative numbers, 0
7. Rational numbers
A number represented by a ratio or a fraction where the denominator is not 0.
8. The rule for multiplying and dividing integers:
• Same sign=always positive
• different signs=always negative
9. Horizontal Slope
A horizontal slope will have an equation of where it meets the y axis. For example, if it crossed the y axis at +5, the equation would be y=5. The slope would be 0.
10. Vertical slope
A vertical line will have an undefined slope because it will intersect the y axis at an indefinite amount of points.
11. Slope
a representation of a rate of change as a line on a graph
12. X axis
The horizontal axis representing the independent variable.
13. Y axis
The vertical axis representing the dependent variable
14. Variable
an unknown value in an equation that is usually represented by a letter, such as x, y, r, s, t, a, b, n or k.
15. Volume
The amount of space within a 3 dimensional object, measured in cm cubed
16. Area
the space within a 2 dimensional object, measured in units squared
17. Diameter of a circle
the distance across a circle