multiplication is a operation
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The 4 basic arithmetic operations are addition, subtraction, division and multiplication.
"opposite" operation. The inverse of subtraction is addition; the inverse operation of multiplication is division.
Remember the memory reminder of BIDMAS which is the order of operations in arithmetic meaning Brackets, Indices, Division, Multiplication, Addition and Subtraction.
Decimals and fractions are ways of representing numbers. Division is an arithmetic operation between two numbers (and the inverse of the multiplication operation). One form of writing the division operation looks like a fraction.
An estimate is related to a number, not an arithmetic operation. Having said that, the estimate MUST take account of the context of the operations (+-*/).