A Conversation for Mnemonics and Other Learning Devices

Arithmetic

Post 1

The Researcher formally known as Dr St Justin

Writen mathematics can be a little confusing. Especially when it's written sloppily. For instance, which of the following is correct?

10-5*2=10
10-5*2=0

Which order should you do the subtraction and multiplication? Common sense would probably tell you to perform the operations in the order that they appear - ie left to right. Unfortunately, this would give the wrong answer for this example!

In fact, the operations should be performed: Brackets, Indices, Division, Multiplication, Addition, Subtraction. Remember this order with BIDMAS.

So our example should be computed as 10-5*2 = 10-10 = 0. smiley - ok


Arithmetic

Post 2

xyroth

my teacher taught that as BODMAS, where the indices were replaced by "of", as in 2 of this or 4 of that.


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