Because it’s just a mnemonic to remember what the order of operations is, not like… What the order of operations is, which you should know already if you know the mnemonic.
Because it’s the only other thing about that system at all. OP wasn’t teaching, just showing what that system does. If you looked for a source that explains it you’d be told
Cool, except you just said
And then you performed:
= 9-1+3
= 8+3
= 11
When you should have done…
= 9-1+3
= 9-4
= 5
Either dear Aunt Sally needs to check her work, or I do.
Multiplication and Division, and Addition and Subtraction are executed at the same level and done in left to right order.
And how is Aunt Sally going to learn if you don’t say that from the start?
Because it’s just a mnemonic to remember what the order of operations is, not like… What the order of operations is, which you should know already if you know the mnemonic.
Because it’s the only other thing about that system at all. OP wasn’t teaching, just showing what that system does. If you looked for a source that explains it you’d be told