In arithmetic's, it is good to calculate complex sums using the BODMAS order. Work on the items in Brackets and then proceed to do Of, Division, Multiplication and any Subtraction tasks.
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Math can be difficult at times. To simplify a math expression, it is important to follow the order of operations, or PEMDAS.
They are used to change the order in which arithmetic operations are to be carried out.
BEDMAS. Brackets, Exponents, Division, Multipication, Addition, Subtraction.
Because without an agreed upon order, some calculations would yield ambiguous results.