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Cheatography

A cheat sheet to help with important topics in Grade 9 Math in Ontario (MTH1W)

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Basic Operat­ions: Addition and Subtra­ction

Operation
Symbol
Meaning
Example
Addition
+
Subtra­ction
-

Order of Operations

BEDMAS
Example: 3(4+5)-42÷2+1
B- Brackets
=3(4+5)-42÷2+1
E- Exponents
=3(9)-42÷2+1
D- Division
=27-16÷2+1
M- Multip­lic­ation
=3(9)-16÷2+1
A- Addition
=19+1
S- Subtra­ction
=27-8+1
Multip­lic­ati­on/­Div­ision and Additi­on/­Sub­tra­ction should be done in the order of WHICHEVER COMES FIRST
Example:
=3(9)-16÷2+1 (multi­pli­cation)
=27-16÷2+1 (division)
=27-8+1 (subtr­action)
=19+1 (addition)