How to apply BODMAS and Pemdas to expressions that involve positive and negative numbers. To obtain a PowerPoint format download of this presentation, go to the following page: http://passyworldofmathematics.com/pwerpoints/

1. Integers Order of Operations

2. 1+2x5=?
Incorrect Method Correct Method
1+2x5 1+2x5
= 3 x5 = 1 + 10
= 15 = 11
Multiplication is done
BODMAS PPemdas
before Addition.

3. 2+3x -4 =?
Incorrect Method Correct Method
-4
2 + 3 x -4 2+3x
-4 =2+ -12
= 5 x
= -20 = -10
Multiplication is done
BODMAS Pemdas
before Addition.

4. 12 ÷ -3 + -3 x2 =?
-3
12 ÷ + x 2-3 BODMAS Pemdas
= -4 + -3 x 2 Do Division and Multiplication
working from left to right.
= -4 + -3 x 2 BODMAS Pemdas
= -4 + -6
= -10

5. ( 6 - 9 ) x 10 ÷ -3 =?
(6 – 9) x 10 ÷ -3 BODMAS Pemdas
= -3 x 10 ÷ -3
= -3 x 10 ÷ -3 BODMAS Pemdas
Do Division and Multiplication
= -30 ÷ -3 working from left to right.
1. 2. 3. 4.
= +10
B 0 D A
or or
= 10 M S

6. 30 ÷ -5 +4x -2 + 14 = ?
-5 -2
30 ÷ + 4 x + 14 BODMAS
= -6 +4x -2 + 14 BODMAS
= -6 + -8 + 14 BODMAS
Do Addition and Subtraction
= -6 + -8 + 14 working from left to right.
1. 2. 3. 4.
= -14 + 14
B 0 D A
= 0 or
M S
or

7. 12 + ( 4 - 20 ) - -6 =?
-6
12 + (4 - 20) - BODMAS
= 12 + -16 - -6 BODMAS
= 12 + -16 - -6 Do Addition and Subtraction
working from left to right.
= -4 - -6
1. 2. 3. 4.
= -4 + +6 B 0 D A
= 2 or
M S
or

8. 1. 2. 3. 4. After you have done "B" and "O",
B O D A (or P and E if using Pemdas)
or or
M S
just go from left to right doing
any "D" or "M" as you find them.
1. 2. 3. 4.
P E M A Then go from left to right doing
or or any "A" or "S" as you find them.
D S

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