2006-09-11 08:09:45 · 11 answers · asked by Anonymous in Education & Reference ➔ Homework Help
The phrase I learned for order of operations was: "Please excuse my dear aunt Sally". Use the first letter of each word to remember the order of operations:
P-arentheses
E-xponents
M-ultiplication
D-ivision
A-ddition
S-ubtraction
In the problem you give, you need to do multiplication first.
The answer should be 23.
2006-09-11 08:18:40 · answer #1 · answered by Bramblyspam 7 · 1⤊ 0⤋
1/ Explanation
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The order of the operation is very important
indeed if you do the operations in the order they are written you get 17 - 4 x 3 + 18 = 13 x 3 - 18 = 39 - 18 = 21
If you do it in the order recommended by the mathematicians (i.e. the correct one) by performing first the multiplication and the division you get 17 - 4 x 3 + 18 = 17 - 12 +18 = 23 which is not at all the 21 of above
2/ Recommendation
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As you can see this kind of problem can easily lead to erroneous response so it is always better to uses parenthesis
17 - (4 x3) + 18 = 23 without any risk of confusion
3/ Remarque
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People with little mathematical education will tend to perform the computation in written order while people who have received more mathematical training will always first perform the raise to power "^" and then the multiply and divide "*" and "/" and finally the addition and substraction "+" and "-"
2006-09-11 15:25:31 · answer #2 · answered by cd4017 4 · 0⤊ 0⤋
Do the mulitplication first....then subtract that answer from 17 then add 18....so 4x3=12 17-12=5 18+5=23 so the answer would be 23 you follow the rules in order PEMDAS (parenthesis, exponents, multiplication, division, addition, subtraction)
2006-09-11 15:36:35 · answer #3 · answered by NiCoLe 3 · 0⤊ 0⤋
Start on the left: 17 - 4 = 13. 13 X 3 = 39. 39 + 18 = 57.........
2006-09-11 15:14:17 · answer #4 · answered by thomasrobinsonantonio 7 · 0⤊ 0⤋
Always remember the order of operations:
1.) Parentheses
2.) exponents and roots
3.) multiplication and division
4.) addition and subtraction
2006-09-11 15:16:50 · answer #5 · answered by ³√carthagebrujah 6 · 0⤊ 0⤋
you have to use the order of opperations:
first do multiplication, then the addition and subtraction
17-4x3+18
17-12+18
5+18
23
2006-09-11 15:14:21 · answer #6 · answered by kat ♥ 2 · 0⤊ 0⤋
Do the Multiplication/Division steps first, then the Addition/Subtraction.
2006-09-11 15:13:47 · answer #7 · answered by Eric C 5 · 0⤊ 0⤋
follow the order and here is the answer 57
2006-09-11 15:41:21 · answer #8 · answered by hannahgray30401 2 · 0⤊ 0⤋
it looks like you have forgotten the brackets...( ). these indicate which equasions are to be done first and seperate ie, (17-4)x3) + 18 = 57
2006-09-11 15:14:12 · answer #9 · answered by moominboy1982 3 · 0⤊ 0⤋
follow thw rules, in this case multiplication 1st then from left to right subtract or add.
2006-09-11 15:15:48 · answer #10 · answered by milky 2 · 0⤊ 0⤋