Math indices, also known as exponents, are used to represent repeated multiplication of a number by itself. The index, typically a small number written above and to the right of a base number, indicates how many times the base number is multiplied by itself. For example, in the expression 5^3, the base number is 5 and the index is 3, meaning 5 is multiplied by itself 3 times (5 x 5 x 5 = 125). Indices are an important concept in mathematics and are used in various mathematical operations and equations.
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In maths indices are little superscript numbers that are powers, ie they tell you how many times to multiply the base number by itself. eg in 103 the 3 is the index (singular of indices) which tells you to multiply 10 by itself thrice, ie 103 = 10 x 10 x 10 = 1000.
Information on indices maths can be found on the Laerd Mathematics website. There are many examples of formulas which one may find informative and useful.
If it is BIDMAS you want then it means: B brackets I indices D divide M multiply A addition S subtract
"indices" is plural of "index".
The singular form for the plural noun indices is index.
Indices (not indicies) have two meanings: one is powers. In the expression x3, the 3 is an index. The second meaning is a counter. If you have five observations and they are labelled X1, X2, ... , X5 then the numbers in Xn is an index.