BODMAS

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BODMAS
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Why do we need BODMAS ?

• when you see something like...
• 7 (6 52 3)
• ... what part should you calculate first?
• Start at the left and go to the right?
• Or go from right to left?
• Calculate them in the wrong order, and you will
  get a wrong answer !
• So, long ago people agreed to always follow
  certain rules when doing calculations. One of
  them is BODMAS

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What is BODMAS ?

• Bracket ( )
• Orders or power Of Powers and Square Roots,
  etc.
• Multiplication
• Division
• Addition
• Subtraction -
• Other names for BODMAS "Exponents" is used in
  Canada, and so you might prefer "BEDMAS". There
  is also "Indices" so that makes it "BIDMAS". In
  the US they say "Parenthesis" instead of
  Brackets, so they say "PEMDAS.

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How do I Remember ? BODMAS!

• B Brackets first
• O Orders (i.e. Powers and Square Roots, etc.)
• DM Division and Multiplication (left-to-right)
• AS Addition and Subtraction (left-to-right)

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Brackets

• Brackets are Parenthesis ( ).
• Brackets are used to group things.
• This is the first thing you do in a question.
• Do things in Brackets First.
•   ? 6 (5 3) 6 8 48 
• ? 6 (5 3) 30 3 33 (wrong)

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Order or Exponents

• (Powers, Roots) before Multiply, Divide, Add or
  Subtract. Example
• Exponents are used to shorten the equation.
• If you see an exponent, you multiply the main
  number by itself that many times.
•  Solve the Exponents first
• ? 5 22 5 4 20
• ? 5 22 102 100 (wrong)

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Multiplication

• In the Order of Operations, you would complete
  the equation left to right, doing which ever one
  appears first, Multiplication or Division.
• The symbol for multiplication is x.
• Remember to go from left to right.
• Multiply or Divide before you Add or Subtract.
• ? 2 5 3 2 15 17
• ? 2 5 3 7 3 21 (wrong)

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Division

• In the Order of Operations, you would complete
  the equation left to right, doing which ever one
  appears first, Multiplication or Division.
• Division is an equation that puts numbers in to
  groups.
• The Division symbol is
• Remember to go from left to right
• ? 30 5 3 6 3 18   
• ? 30 5 3 30 15 2(wrong)

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Addition

• In the Order of Operations, you would complete
  the equation left to right, doing which ever one
  appears first, Addition or Subtraction.
• Addition is adding numbers together.
• The symbol for addition is .
• Example 6 9 15

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Subtraction

• In the Order of Operations, you would complete
  the equation left to right, doing which ever one
  appears first, Addition or Subtraction.
• Subtraction is taking away a specific number.
• The symbol for subtraction is -.
• Example 17 8 9

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Summary
BODMAS is a word which helps us to remember the
order we do in a maths sum. It
stands for first, then
. Next do or (it
does not matter which way round you do
these). Finally do or
(again, it does not matter which way you do
these.) Some people use the word Bidmas. In this
case is replaced by ,
which means the same thing.
operations
brackets
powers of
division
multiplication
addition
subtraction
powers of
indices
Copy and fill in the gaps using the words below
operations
multiplication
brackets
subtraction
division
addition
powers of
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Sample Equation

• 4 3 6 - (12 22 5)

4 3 6 - (12 4 5)
4 3 6 - (3 5)
4 3 6 - (8)
12 6 8
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