shlomo Posted December 10, 2015 Posted December 10, 2015 common sense being at the top of the list...... Far from it unless you understand the underlying principles. Bemdas is taught here in grade 5 or 6 and only after a thorough understanding of multiplication/division and a good amount of exponent work. Think of multiplication as repeated addition and this 2+3 x 4 will make more sense. The answer is 10. 14 ignores the order of operations. 3
JohnS Posted December 10, 2015 Posted December 10, 2015 Far from it unless you understand the underlying principles. Bemdas is taught here in grade 5 or 6 and only after a thorough understanding of multiplication/division and a good amount of exponent work. Think of multiplication as repeated addition and this 2+3 x 4 will make more sense. The answer is 10. 14 ignores the order of operations. That's correct. In the Australian Education system, it's taught in the same grades and the order of operations is known as either BODMAS or BIDMAS.
... Posted December 10, 2015 Posted December 10, 2015 Far from it unless you understand the underlying principles. Bemdas is taught here in grade 5 or 6 and only after a thorough understanding of multiplication/division and a good amount of exponent work. Think of multiplication as repeated addition and this 2+3 x 4 will make more sense. The answer is 10. 14 ignores the order of operations. Yep. Wrong intuitions are sometimes confused with common sense... 2
Habanos2000 Posted December 10, 2015 Posted December 10, 2015 That's correct. In the Australian Education system, it's taught in the same grades and the order of operations is known as either BODMAS or BIDMAS. Interesting... Here in the states it's called PEMDAS and multiplication comes before division.
Benzopyrene Posted December 11, 2015 Posted December 11, 2015 FML I should return to elementary school and start over again!
shlomo Posted December 11, 2015 Posted December 11, 2015 Interesting... Here in the states it's called PEMDAS and multiplication comes before division. No. Multiplication is interchangeable with division, same with addition and subtraction. Within each sub group it is read left to right whichever comes first. For instance; 100÷2-5×6+2 Is broken down to; 50-30+2 = 22
planetary Posted December 11, 2015 Posted December 11, 2015 From the Department of Counter-Intuitive Mathematics, this is a doozie: Worth the 7 minutes to bend your mind. 2
Fugu Posted December 11, 2015 Posted December 11, 2015 No. Multiplication is interchangeable with division, same with addition and subtraction. Within each sub group it is read left to right whichever comes first. For instance; 100÷2-5×6+2 Is broken down to; 50-30+2 = 22 Guess Habanos meant PEDMAS as opposed to PEMDAS (and anyway - division is just another form of multiplication)
aushy Posted December 11, 2015 Posted December 11, 2015 From the Department of Counter-Intuitive Mathematics, this is a doozie: Worth the 7 minutes to bend your mind. This is actually amazing. I understand the maths, but I can't get my head around it how this is possible in real terms. How can the infinite addition of only positive numbers give a negative :/ 1
Fugu Posted December 11, 2015 Posted December 11, 2015 This is actually amazing. I understand the maths, but I can't get my head around it how this is possible in real terms. The same here. What I have trouble in wrapping my mind around is accepting the first (and essential) basic assumption, that +1-1+1-1... performed to infinity can be set equal with the average of the two results, of either 0 or 1 (there is a link in the vid giving a good explanation to that, beautifully explained, the guy is brilliant, I found myself watching on and on ....). I guess that's the charme of this very example, demonstrating that in mathematics there do exist phenomenons, effects and paradoxons that our simple and preset minds just can't grasp easily, intuition will leave us high and dry. 1
Habana Mike Posted December 12, 2015 Posted December 12, 2015 Brshoppe, and the explanation is correct 10 is the answer. Brackets not required. You can always check a calculator is correctly programmed by running a simple check. If you type 2 + 3 x 4 and it gives you the answer of 20 - don't rely on that calculator! Most cheap ones will give you the wrong answer of 20. Interesting this. Typed 2 + 3 * 4 in to the iPad calculator, got 20 Typed 2 + (3 * 4), got 20 Hmmmm.....
Pixa Posted December 12, 2015 Posted December 12, 2015 Interesting this. Typed 2 + 3 * 4 in to the iPad calculator, got 20 Typed 2 + (3 * 4), got 20 Hmmmm..... Mines gives 14 both ways maybe yours is fake
Fosgate Posted December 12, 2015 Posted December 12, 2015 You're all wrong! The answer is purple because space aliens cant fly. Why don't you people understand it when it is staring you in the face? It's so simple. At least that's how my College Calculus Professor would have explained it.
planetary Posted December 12, 2015 Posted December 12, 2015 Interesting this. Typed 2 + 3 * 4 in to the iPad calculator, got 20 Typed 2 + (3 * 4), got 20 Hmmmm..... What you want to type is 4+3*2. If you type this into Google (which is also a calculator) it will add the parens around the multiplication term to make it more readable.
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