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 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 June 30th, 2019, 06:18 PM #1 Newbie   Joined: Jun 2019 From: New York Posts: 23 Thanks: 0 Can you solve this math test? A) 3 + 3 × 3 - 3 + 3=? B) 3 + 3 × (3 - 3) ÷ 3=? Is the answer for both A & B the same? Sent from my SM-J727T1 using Tapatalk Last edited by skipjack; July 1st, 2019 at 04:10 PM.
June 30th, 2019, 06:29 PM   #2
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Quote:
 Originally Posted by NinjaX3 Is the answer for both A & B the same?
No

 June 30th, 2019, 07:33 PM #3 Math Team     Joined: May 2013 From: The Astral plane Posts: 2,257 Thanks: 928 Math Focus: Wibbly wobbly timey-wimey stuff. See here for order of operations. The reason this is so hard for many is that High School teachers (I don't know about Middle School) have tended to get away from using parenthesis properly. For example you often see on the different forums something like this: f(x)= 2x + 3/8x - 5. This is intended to be f(x) = (2x + 3)/(8x - 5), but as written is $\displaystyle f(x) = 2x + \dfrac{3}{8} x - 5$ instead of $\displaystyle f(x) = \dfrac{2x + 3}{8x - 5}$. I'm not blaming just the instructors... the students should be picking up on this as well. -Dan Thanks from Joppy
July 1st, 2019, 02:28 AM   #4
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Quote:
 Originally Posted by topsquark See here for order of operations. The reason this is so hard for many is that High School teachers (I don't know about Middle School) have tended to get away from using parenthesis properly. For example you often see on the different forums something like this: f(x)= 2x + 3/8x - 5. This is intended to be f(x) = (2x + 3)/(8x - 5), but as written is $\displaystyle f(x) = 2x + \dfrac{3}{8} x - 5$ instead of $\displaystyle f(x) = \dfrac{2x + 3}{8x - 5}$. I'm not blaming just the instructors... the students should be picking up on this as well. -Dan
You are right. I have noticed this problem beginning in middle school, which then leaks into high school. With this continuing, it causes a snowball effect.

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Last edited by skipjack; July 1st, 2019 at 04:56 AM.

July 2nd, 2019, 02:06 PM   #5
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Quote:
 Originally Posted by NinjaX3 Can you solve this math test?
Why are you posting tests on the General Math forum?

 July 2nd, 2019, 02:09 PM #6 Newbie   Joined: Jun 2019 From: New York Posts: 23 Thanks: 0 Hello, since I am new, where would be the best place to post questions? Sent from my SM-J727T1 using Tapatalk
July 2nd, 2019, 04:55 PM   #7
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Quote:
 Originally Posted by NinjaX3 Hello, since I am new, where would be the best place to post questions? Sent from my SM-J727T1 using Tapatalk
new....

please, you must think we're idiots

 July 3rd, 2019, 12:51 AM #8 Global Moderator   Joined: Dec 2006 Posts: 20,926 Thanks: 2205 Moved to Elementary Math. Thanks from topsquark
July 3rd, 2019, 02:05 PM   #9
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Quote:
 Originally Posted by NinjaX3 … where would be the best place to post [such] questions?
In Volume XXVIII of your notes.

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