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BODMAS

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by

Ben Wilson

on 9 July 2013

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Transcript of BODMAS

Maths speak = Order of operations
We need rules!
BODMAS in action (1)
BODMAS in action (2)
What are the rules?
1.
B
rackets
2.
O
rder
3.
D
ivide
4.
M
ultiply
5.
A
dd
6.
S
ubtract

BODMAS
How to correctly enter numbers into your calculator
Crash on the right
Drive on the left...
The maths problem
8 + 2 x 3 = ???
30?
14?
B
rackets
( )
O
rder
(15 - 10) / 2
1.
B
rackets
(
15 - 10
)
= 5
(15 - 10) / 2
5 / 2
15 - 10 / 2
1.
D
ivide
10
/
2 = 5
15 - 5
15 - 10 / 2
15 - 5 = 10
5 / 2 = 2.5
D
ivide
M
ultiply
/
.
A
dd
S
ubtract
5y = 10
+
-
1.
O
rder

4 = 2
√4 + 21
2 + 21
2 + 21
√(4 + 21)
1.
B
rackets
(
4 + 21
)
= 25
√(4 + 21)
√25
√25
= 5
√4 + 21
= 23
BODMAS for professionals
25 + (12 x 5) - √9
1.
B
rackets
25 +
(
12 x 5
)
- √9
(
12 x 5
)
= 60
25 + (12 x 5) - √9
25 + 60 - √9
2.
O
rder
25 + 60 -

9

9 = 3
25 + 60 - √9
25 + 60 - 3
25
+
60 - 3
3.
A
ddition
85 - 3
4.
S
ubtract
85
-
3 = 82
25 + (12 x 5) - √9
= 82
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