School of Psychology

BIMDAS: Using formulae


When using formulae, the BIMDAS rule applies and some operations are performed before other operations. To get the right answer, it is important to get the order of operations right.

Recall that the BIMDAS rule is:
          B - Brackets first
          I - Indices second
          MD - Multiplication and Division next
          AS -¬†Addition and Subtraction last

For example, let's calculate:
             (7 - 2)2 ÷ 5 + 6
          = (5)2 ÷ 5 + 6 (Brackets first)
          = 25 ÷ 5 + 6 (Indices next)
          = 5 + 6 (Multiplication/Division next)
          = 11 (Addition/Subtraction last)
          = 11.00 (to 2 decimal places)

If your answer falls between 0 and 1, please omit the leading zero:
          for 0.22, just type .22
          for -0.22, just type -.22


In this task, you will be given an algebraic formula and the numbers corresponding to each letter in the formula. To solve the problem, you will need to substitute the numbers into the formula and then use the BIMDAS rule of order to work out the answer.

Let's try some examples to check that you understand the rules.
Give your answer to 2 decimal places.

Take your time and concentrate on getting the right answer.

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