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


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June 30th, 2019, 06:18 PM   #1
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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?

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Last edited by skipjack; July 1st, 2019 at 04:10 PM.
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June 30th, 2019, 06:29 PM   #2
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Is the answer for both A & B the same?
No
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June 30th, 2019, 07:33 PM   #3
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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
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July 1st, 2019, 02:28 AM   #4
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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.
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July 2nd, 2019, 02:06 PM   #5
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Can you solve this math test?
Why are you posting tests on the General Math forum?
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July 2nd, 2019, 02:09 PM   #6
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Hello, since I am new, where would be the best place to post questions?

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July 2nd, 2019, 04:55 PM   #7
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Hello, since I am new, where would be the best place to post questions?

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new....

please, you must think we're idiots
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July 3rd, 2019, 12:51 AM   #8
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Moved to Elementary Math.
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July 3rd, 2019, 02:05 PM   #9
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… where would be the best place to post [such] questions?
In Volume XXVIII of your notes.
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