Arithmetic Flashcards
Positive * positive =
Positive
Positive * negative =
Negative
Negative * negative =
Positive
Least common multiple of 2 numbers =
The least positive number that is a multiple
Even + even =
Even
Odd + Even =
Odd
Odd + odd =
Even
Even * even =
Even
Odd * odd =
Odd
Even * Odd =
Even
Adding/subtracting 2 fractions
Find common denominator first
add/subtract numerators
Multiplying fractions
Simply multiply both numerators
Multiply both denominators
Diving fractions:
Turn second fraction upside down
Multiply
X/Y / A/B = X/Y * B/A
Negative Number ^ Even Number
Always positive
Negative Number ^ odd number
Always negative
(√a)^2 =
a
√a^2 =
a
√a√b =
√(ab)
√a/√b =
√(a/b)
Irrational Numbers
Decimal number that doesn’t terminate or repeat the same pattern (recurring)
Real Numbers
All rational, irrational, integers, fractions, decimals etc.
Represented on the ‘Real Number Line’
Interval
A set of Real Numbers between 2 points on the Real Number Line.
Example: a< X < 3
(Can include ‘greater than or equal to’ ‘less than or equal to’ signs too)
Absolute Value
The distance between a number and 0 on a Real Number Line
Written as:
|x|
Example : |3| = 3 , |-3| = 3
|r| |s| =
|rs|
Example:
|5| |-2| = |(5*-2)| = |-10| = 10
|5| |-2| = 5*2 = 10
|r+s|
|r| + |s| “Triangle Inequality”
Percent Change - Increase Percentage =
Amount of increase / original number
Percent Change - Decrease Percentage
Amount of decrease / original number
