The Singing Hedgehog Guide to:
BIDMAS 4
Traps to beware

1.    Trouble with signs:

4 - 2 + 10

here most people ignore the minus sign and end up with:

4 - 12 = -8    this is wrong!!!       

we are allowed to subtract before we add:

2 + 10 = 12    this is now right!!!       

next page

return to SHG main page