5 + 5 + 5 - 5 + 5 + 5 - 5 x 0 (a lot of people answer this wrongly)
in my school days, i was taught that the whole equation was zero...
then when i google the answer, it says 20. The order of maths operation is in this example link http://www.mathgoodies.com/lessons/vol7/order_operations.html
Looks like either we were taught wrongly in school or the methods of mathematics operation have changed
Problem: Evaluate the following arithmetic expression:
3 + 4 x 2
Solution:
Student 1 Student 2
3 + 4 x 2 3 + 4 x 2
= 7 x 2 = 3 + 8
= 14 = 11
It seems that each student interpreted the problem differently, resulting in two different answers. Student 1 performed the operation of addition first, then multiplication; whereas student 2 performed multiplication first, then addition. When performing arithmetic operations there can be only one correct answer. We need a set of rules in order to avoid this kind of confusion. Mathematicians have devised a standard order of operations for calculations involving more than one arithmetic operation.
Rule 1: First perform any calculations inside parentheses.
Rule 2: Next perform all multiplications and divisions, working from left to right.
Rule 3: Lastly, perform all additions and subtractions, working from left to right.
The above problem was solved correctly by Student 2 since she followed Rules 2 and 3. Let's look at some examples of solving arithmetic expressions using these rules.
then when i google the answer, it says 20. The order of maths operation is in this example link http://www.mathgoodies.com/lessons/vol7/order_operations.html
Looks like either we were taught wrongly in school or the methods of mathematics operation have changed
Problem: Evaluate the following arithmetic expression:
3 + 4 x 2
Solution:
Student 1 Student 2
3 + 4 x 2 3 + 4 x 2
= 7 x 2 = 3 + 8
= 14 = 11
It seems that each student interpreted the problem differently, resulting in two different answers. Student 1 performed the operation of addition first, then multiplication; whereas student 2 performed multiplication first, then addition. When performing arithmetic operations there can be only one correct answer. We need a set of rules in order to avoid this kind of confusion. Mathematicians have devised a standard order of operations for calculations involving more than one arithmetic operation.
Rule 1: First perform any calculations inside parentheses.
Rule 2: Next perform all multiplications and divisions, working from left to right.
Rule 3: Lastly, perform all additions and subtractions, working from left to right.
The above problem was solved correctly by Student 2 since she followed Rules 2 and 3. Let's look at some examples of solving arithmetic expressions using these rules.
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Answer is 20.
Algorithm: BODMAS
Do operations in the following priority (from highest to lowest):
Brackets
Of
Division
Multiplication
Addition
Subtraction
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anything devided by kosong will get eternity ...
Is infinity and not eternity, you chump!!
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my ex maths teachers some of them already died. fire them in heaven?
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How about this one :
What is the Sqaure Root of negative One (-1)?
What is the Sqaure Root of negative One (-1)?
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Well, I hope they are not teaching maths in Heaven or Hell!!
Clarification, I mean they should have been at that point in time!!
Last edited:
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aiyah, eternity followed by the
should have given you a clue lah.......................the second chump has u as one of her 2 friends leh........................... :o
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limpeh wan say eternity beh sai meh ? :p
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Since everything multiplied by zero = 0, e.g.
1 x 0 = 0
2 x 0 = 0
3 x 0 = 0
... the inverse operation - 0/0 - can be any number (1, 2, 3 ...)
So 0/0 is undefined.
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Correct! Upz you 7 points.
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Most math calculators will do BODMAS, but can't handle imaginary numbers like √-1.
An ordinary calculator will just do the operations from left to right, giving you an answer of 0.
so which answer is correct? scientific calculator presents 20 and the non scientific calculator presents 0.
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20 is the correct answer. See my post #84 above.
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