If it is BIDMAS you want then it means:
B brackets
I indices
D divide
M multiply
A addition
S subtract
metre
It doesn't "stand for" anything. And wrong category.
a variable is a letter that stand for another number
The Roman numerals, XVI, stands for 16 (sixteen).
mathamatical algebra theoretical geometry hexagon six
It doesn't stand for bananas.
3000
metre
elementary maths
It doesn't "stand for" anything. And wrong category.
maths economics comers
An unknown number.
TWICE AS IN TWICE DAILY
LCM stand for Least Common Multiple
Base times Height
Small/lower case 'x' means nothing in Roman Numerals. Capital 'X' means ' 10'. NB All the letters used in Roman Numerals are ALWAYS CAPITAL letters. Lower case letters do not mean a thing.
Terrible teachers failing maths